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Discussion Starter · #1 ·
On two different highway trips I have got DTC B1904 (Air Bag Crash Sensor #2 Feed/Return Circuit Failure). When this happens the truck goes into limp mode with the CEL on and it's quite annoying and dangerous. Luckily I wasn't towing a trailer or I would have been in serious trouble as you can barely get out of your own way. When you clear the code it runs fine. Are there actual sensors somewhere near the front bumper because I've looked and found nothing or are they built into the airbag assembly? I'm assuming that Sensor #1 would be driver's side and #2 the passenger side. Both airbags were replaced under a recall in the last couple of years. Since I don't want the airbags going off I'll probably have to take it to the dealer but hoping someone can add some insight as to what is happening. Thanks.
 

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Get a copy of the FSM and you may be able to chase down the location with it.
FSM here
 

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Discussion Starter · #3 ·
Get a copy of the FSM and you may be able to chase down the location with it.
FSM here
Thanks for the link, unfortunately I couldn't find any details referencing crash sensor #2. The air bag control module is on top of the transmission tunnel below the console but the service material doesn't give any details about how it works...maybe it's in the manual somewhere but I couldn't find it. I suspect they don't want DYI'ers messing with this safety stuff.
 

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Never heard limp mode from Airbag fault only.
Suspect something else going on,any cluster codes??
Fsm section 8o has all info/location/components in system depending on passive restraint options for your truck .
 

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Discussion Starter · #6 ·
Never heard limp mode from Airbag fault only.
Suspect something else going on,any cluster codes??
Fsm section 8o has all info/location/components in system depending on passive restraint options for your truck .
You're the second person to suggest that the airbag fault won't trip limp mode. I checked the picture I took of the faults and I dismissed code P3202 as not valid as it listed it as unknown and I couldn't find any reference to it online. Perhaps this is the real clue as to what the problem is. Do you know what this code is?
931374
 

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AFAIK, P3202 not dodge code
Try real scanner DRBIII or equivalent that can read Dodge PCI serial bus.
Concerning Bullydog be careful known to brick ECMs in 03-05 Cummins.
Try to return to stock see if issue goes away ??

Also would try perform cluster test, free and easy

1. Begin the test with the ignition switch in the Off position.

2. Depress the odometer/trip odometer switch button.

3. While still holding the odometer/trip odometer switch button depressed, turn the ignition switch to the On position,
but do not start the engine.

4. Release the odometer/trip odometer switch button.

5. The instrument cluster will simultaneously begin to illuminate all of the operational segments in both VFD units
and perform a bulb check of each operational LED indicator. The VFD segments and LED indicators remain
illuminated as each gauge needle is swept to several calibration points and back. If a VFD segment or an LED
indicator fails to illuminate, or if a gauge needle fails to sweep through the calibration points and back during this
test, the instrument cluster must be replaced. Following these tests, the actuator test will proceed as described
in Step 6.

6. The text “C Code” is displayed in the odometer VFD for about three seconds. If there is no stored fault information,
the display will show two pairs of zeroes in the format “00” “00”, which indicate that the display of fault
information is done. If there is stored fault information, two sets of two-digit alpha and alpha-numeric fault codes
will appear in the odometer display for a three second interval. The first pair of digits represents a Diagnostic
Trouble Code (DTC), or fault code for the instrument cluster. The second pair of digits is a counter for the number
of ignition key cycles that have occurred since the displayed DTC was set. The instrument cluster will continue
to display additional sets of two pairs of digits at three second intervals until all of the stored codes have
been displayed, which is again signaled by a code of “00” “00”. Refer to the Instrument Cluster Failure Message
table for a description of each fault code that the instrument cluster displays. If an instrument cluster fault is
displayed, use a diagnostic scan tool to diagnose the problem. Refer to the appropriate diagnostic information.

INSTRUMENT CLUSTER FAILURE MESSAGE
FAULT CODE, DESCRIPTION, CORRECTION

01 Cargo lamp LED output circuit open load/short to ground. Refer to the appropriate diagnostic
information.
02 Cargo lamp LED output circuit overload/short to battery. Refer to the appropriate diagnostic
information.
03 Door ajar LED output circuit open load/short to ground. Refer to the appropriate diagnostic
information.
04 Door ajar LED output circuit overload/ short to battery. Refer to the appropriate diagnostic
information.
05 ETC LED output circuit open load/short to ground. Refer to the appropriate diagnostic
information.
06 ETC LED output circuit overload/short to battery. Refer to the appropriate diagnostic
information.
07 Seatbelt LED output circuit open load/short to ground. Refer to the appropriate diagnostic
information.
08 Seatbelt LED output circuit overload/short to battery. Refer to the appropriate diagnostic
information.
09 Air Bag LED output circuit open load/short to ground. Refer to the appropriate diagnostic
information.
0A Air Bag LED output circuit overload/short to battery. Refer to the appropriate diagnostic
information.
0B BTSI output circuit shorted or open. Refer to the appropriate diagnostic
information.
0C PRNDL switch input circuit low. Refer to the appropriate diagnostic
information.
0D PRNDL switch input circuit high. Refer to the appropriate diagnostic
information.
0E DTCM switch input circuit low. Refer to the appropriate diagnostic
information.
0F DTCM switch input circuit high. Refer to the appropriate diagnostic
information.
20 Panel dimmer input circuit low. Refer to the appropriate diagnostic
information.
21 Panel dimmer input circuit high. Refer to the appropriate diagnostic
information.
22 Headlamp switch input circuit shorted. Refer to the appropriate diagnostic
information.
23 Headlamp switch input circuit open. Refer to the appropriate diagnostic
information.
24 Turn hazard switch input circuit shorted. Refer to the appropriate diagnostic
information.
25 Turn hazard swiitch inpot circuit open. Refer to the appropriate diagnostic
information.
26 Panel illumination output circuit low/high fault. Refer to the appropriate diagnostic
information.
27 Courtesy/dome output circuit shorted or open. Refer to the appropriate diagnostic
information.
28 Glovebox/map lamp output circuit shorted or open. Refer to the appropriate diagnostic
information.
29 Cargo lamp output circuit shorted or open. Refer to the appropriate diagnostic
information.
2B High Beam LED output circuit open load/short to ground. Refer to the appropriate diagnostic
information.
2C High Beam LED output circuit overload/short to battery. Refer to the appropriate diagnostic
information.
2D Brake LED output circuit open load/short to ground. Refer to the appropriate diagnostic
information.
2E Brake LED output circuit overload/short to battery. Refer to the appropriate diagnostic
information.
2F Check Gages LED output circuit open load/short to ground. Refer to the appropriate diagnostic
information.
30 Check Gages LED output circuit overload/short to battery. Refer to the appropriate diagnostic
information.
31 ABS LED output circuit open load/short to ground. Refer to the appropriate diagnostic
information.
32 ABS LED output circuit overload/short to battery. Refer to the appropriate diagnostic
information.
33 MIL LED output circuit open load/short to ground. Refer to the appropriate diagnostic
information.
34 MIL LED output circuit overload/short to battery. Refer to the appropriate diagnostic
information.
35 Water in Fuel LED output circuit open load/short to ground. Refer to the appropriate diagnostic
information.
36 Water in Fuel LED output circuit overload/short to battery. Refer to the appropriate diagnostic
information.
37 Wait to Start LED output circuit open load/short to ground. Refer to the appropriate diagnostic
information.
38 Wait to Start LED output circuit overload/short to battery. Refer to the appropriate diagnostic
information.
39 Trans Temp LED output circuit open load/short to ground. Refer to the appropriate diagnostic
information.
3A Trans Temp LED output circuit overload/short to battery. Refer to the appropriate diagnostic
information.
3B Low Fuel LED output circuit open load/short to ground. Refer to the appropriate diagnostic
information.
3C Low Fuel LED output circuit overload/short to battery. Refer to the appropriate diagnostic
information.
3D BTSI output circuit high fault. Refer to the appropriate diagnostic
information.
40 Wiper switch input circuit shorted. Refer to the appropriate diagnostic
information.
41 Wiper switch input circuit open. Refer to the appropriate diagnostic
information.
42 Wash/beam input circuit shorted. Refer to the appropriate diagnostic
information.
60 Passenger door lock switch input circuit shorted. Refer to the appropriate diagnostic
information.
61 Passenger door lock switch input circuit open. Refer to the appropriate diagnostic
information.
62 Passenger door lock switch input circuit stuck. Refer to the appropriate diagnostic
information.
63 Driver door lock switch input circuit shorted. Refer to the appropriate diagnostic
information.
64 Driver door lock switch input circuit open. Refer to the appropriate diagnostic
information.
65 Driver door lock switch input circuit stuck. Refer to the appropriate diagnostic
information.
66 All door lock output circuit shorted to ground or voltage. Refer to the appropriate diagnostic
information.
67 All door unlock output circuit shorted to ground or voltage. Refer to the appropriate diagnostic
information.
68 Driver door unlock output circuit shorted to ground or voltage. Refer to the appropriate diagnostic
information.
6C Driver cylinder lock switch input circuit shorted. Refer to the appropriate diagnostic
information.
6E Driver cylinder lock switch input circuit stuck. Refer to the appropriate diagnostic
information.
80 Incorrect odometer value found. Refer to the appropriate diagnostic
information.

81 Remote radio switch input circuit high. Refer to the appropriate diagnostic
information.
82 Remote radio switch stuck. Refer to the appropriate diagnostic
information.
A0 Internal module FLASH memory checksum failure. Refer to the appropriate diagnostic
information.
A1 Internal module bootloader failure. Refer to the appropriate diagnostic
information.
A3 Battery voltage open. Refer to the appropriate diagnostic
information.
A4 Ignition Run/Start circuit rationality. Refer to the appropriate diagnostic
information.
A5 TCCM messages not received. Refer to the appropriate diagnostic
information.
A6 Ignition Unlock circuit rationality. Refer to the appropriate diagnostic
information.
A7 VIN checksum error. Refer to the appropriate diagnostic
information.
A8 VIN previously stored. Refer to the appropriate diagnostic
information.
A9 PCI bus internal failure. Refer to the appropriate diagnostic
information.
AA PCM messages not received. Refer to the appropriate diagnostic
information.
AB TCM messages not received. Refer to the appropriate diagnostic
information.
AC ABS messages not received. Refer to the appropriate diagnostic
information.
AD FCM messages not received. Refer to the appropriate diagnostic
information.
AE ACM messages not received. Refer to the appropriate diagnostic
information.
AF SKIM messages not received. Refer to the appropriate diagnostic
information.
B0 RKE fob batteries low. Refer to the appropriate diagnostic
information.
B1 RKE module communication link. Refer to the appropriate diagnostic
information.
B2 Left Turn LED open circuit. Refer to the appropriate diagnostic
information.
B3 Left Turn LED short circuit/overtemp condition. Refer to the appropriate diagnostic
information.
B4 Right Turn LED open circuit. Refer to the appropriate diagnostic
information.
B5 Right Turn LED sshort circuit/overtemp condition. Refer to the appropriate diagnostic
information.
B6 Panel illumination open circuit. Refer to the appropriate diagnostic
information.
B7 Dome lamp open circuit. Refer to the appropriate diagnostic
information.
B8 Cargo lamp open circuit. Refer to the appropriate diagnostic
information.
B9 Door Unlock to Lock all shorted to ground. Refer to the appropriate diagnostic
information.
00 Done All Diagnostic Trouble Codes (DTC)
have been displayed.
7. The actuator test is now completed. The instrument cluster will automatically exit the self-diagnostic mode and
return to normal operation at the completion of the test, if the ignition switch is turned to the Off position during
the test, or if a vehicle speed message indicating that the vehicle is moving is received from the PCM over the
PCI data bus during the test.
8. Go back to Step 1 to repeat the test, if necessary.
 

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Registered
Joined
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155 Posts
Discussion Starter · #8 ·
AFAIK, P3202 not dodge code
Try real scanner DRBIII or equivalent that can read Dodge PCI serial bus.
Concerning Bullydog be careful known to brick ECMs in 03-05 Cummins.
Try to return to stock see if issue goes away ??

Also would try perform cluster test, free and easy

1. Begin the test with the ignition switch in the Off position.

2. Depress the odometer/trip odometer switch button.

3. While still holding the odometer/trip odometer switch button depressed, turn the ignition switch to the On position,
but do not start the engine.

4. Release the odometer/trip odometer switch button.

5. The instrument cluster will simultaneously begin to illuminate all of the operational segments in both VFD units
and perform a bulb check of each operational LED indicator. The VFD segments and LED indicators remain
illuminated as each gauge needle is swept to several calibration points and back. If a VFD segment or an LED
indicator fails to illuminate, or if a gauge needle fails to sweep through the calibration points and back during this
test, the instrument cluster must be replaced. Following these tests, the actuator test will proceed as described
in Step 6.

6. The text “C Code” is displayed in the odometer VFD for about three seconds. If there is no stored fault information,
the display will show two pairs of zeroes in the format “00” “00”, which indicate that the display of fault
information is done. If there is stored fault information, two sets of two-digit alpha and alpha-numeric fault codes
will appear in the odometer display for a three second interval. The first pair of digits represents a Diagnostic
Trouble Code (DTC), or fault code for the instrument cluster. The second pair of digits is a counter for the number
of ignition key cycles that have occurred since the displayed DTC was set. The instrument cluster will continue
to display additional sets of two pairs of digits at three second intervals until all of the stored codes have
been displayed, which is again signaled by a code of “00” “00”. Refer to the Instrument Cluster Failure Message
table for a description of each fault code that the instrument cluster displays. If an instrument cluster fault is
displayed, use a diagnostic scan tool to diagnose the problem. Refer to the appropriate diagnostic information.

INSTRUMENT CLUSTER FAILURE MESSAGE
FAULT CODE, DESCRIPTION, CORRECTION

01 Cargo lamp LED output circuit open load/short to ground. Refer to the appropriate diagnostic
information.
02 Cargo lamp LED output circuit overload/short to battery. Refer to the appropriate diagnostic
information.
03 Door ajar LED output circuit open load/short to ground. Refer to the appropriate diagnostic
information.
04 Door ajar LED output circuit overload/ short to battery. Refer to the appropriate diagnostic
information.
05 ETC LED output circuit open load/short to ground. Refer to the appropriate diagnostic
information.
06 ETC LED output circuit overload/short to battery. Refer to the appropriate diagnostic
information.
07 Seatbelt LED output circuit open load/short to ground. Refer to the appropriate diagnostic
information.
08 Seatbelt LED output circuit overload/short to battery. Refer to the appropriate diagnostic
information.
09 Air Bag LED output circuit open load/short to ground. Refer to the appropriate diagnostic
information.
0A Air Bag LED output circuit overload/short to battery. Refer to the appropriate diagnostic
information.
0B BTSI output circuit shorted or open. Refer to the appropriate diagnostic
information.
0C PRNDL switch input circuit low. Refer to the appropriate diagnostic
information.
0D PRNDL switch input circuit high. Refer to the appropriate diagnostic
information.
0E DTCM switch input circuit low. Refer to the appropriate diagnostic
information.
0F DTCM switch input circuit high. Refer to the appropriate diagnostic
information.
20 Panel dimmer input circuit low. Refer to the appropriate diagnostic
information.
21 Panel dimmer input circuit high. Refer to the appropriate diagnostic
information.
22 Headlamp switch input circuit shorted. Refer to the appropriate diagnostic
information.
23 Headlamp switch input circuit open. Refer to the appropriate diagnostic
information.
24 Turn hazard switch input circuit shorted. Refer to the appropriate diagnostic
information.
25 Turn hazard swiitch inpot circuit open. Refer to the appropriate diagnostic
information.
26 Panel illumination output circuit low/high fault. Refer to the appropriate diagnostic
information.
27 Courtesy/dome output circuit shorted or open. Refer to the appropriate diagnostic
information.
28 Glovebox/map lamp output circuit shorted or open. Refer to the appropriate diagnostic
information.
29 Cargo lamp output circuit shorted or open. Refer to the appropriate diagnostic
information.
2B High Beam LED output circuit open load/short to ground. Refer to the appropriate diagnostic
information.
2C High Beam LED output circuit overload/short to battery. Refer to the appropriate diagnostic
information.
2D Brake LED output circuit open load/short to ground. Refer to the appropriate diagnostic
information.
2E Brake LED output circuit overload/short to battery. Refer to the appropriate diagnostic
information.
2F Check Gages LED output circuit open load/short to ground. Refer to the appropriate diagnostic
information.
30 Check Gages LED output circuit overload/short to battery. Refer to the appropriate diagnostic
information.
31 ABS LED output circuit open load/short to ground. Refer to the appropriate diagnostic
information.
32 ABS LED output circuit overload/short to battery. Refer to the appropriate diagnostic
information.
33 MIL LED output circuit open load/short to ground. Refer to the appropriate diagnostic
information.
34 MIL LED output circuit overload/short to battery. Refer to the appropriate diagnostic
information.
35 Water in Fuel LED output circuit open load/short to ground. Refer to the appropriate diagnostic
information.
36 Water in Fuel LED output circuit overload/short to battery. Refer to the appropriate diagnostic
information.
37 Wait to Start LED output circuit open load/short to ground. Refer to the appropriate diagnostic
information.
38 Wait to Start LED output circuit overload/short to battery. Refer to the appropriate diagnostic
information.
39 Trans Temp LED output circuit open load/short to ground. Refer to the appropriate diagnostic
information.
3A Trans Temp LED output circuit overload/short to battery. Refer to the appropriate diagnostic
information.
3B Low Fuel LED output circuit open load/short to ground. Refer to the appropriate diagnostic
information.
3C Low Fuel LED output circuit overload/short to battery. Refer to the appropriate diagnostic
information.
3D BTSI output circuit high fault. Refer to the appropriate diagnostic
information.
40 Wiper switch input circuit shorted. Refer to the appropriate diagnostic
information.
41 Wiper switch input circuit open. Refer to the appropriate diagnostic
information.
42 Wash/beam input circuit shorted. Refer to the appropriate diagnostic
information.
60 Passenger door lock switch input circuit shorted. Refer to the appropriate diagnostic
information.
61 Passenger door lock switch input circuit open. Refer to the appropriate diagnostic
information.
62 Passenger door lock switch input circuit stuck. Refer to the appropriate diagnostic
information.
63 Driver door lock switch input circuit shorted. Refer to the appropriate diagnostic
information.
64 Driver door lock switch input circuit open. Refer to the appropriate diagnostic
information.
65 Driver door lock switch input circuit stuck. Refer to the appropriate diagnostic
information.
66 All door lock output circuit shorted to ground or voltage. Refer to the appropriate diagnostic
information.
67 All door unlock output circuit shorted to ground or voltage. Refer to the appropriate diagnostic
information.
68 Driver door unlock output circuit shorted to ground or voltage. Refer to the appropriate diagnostic
information.
6C Driver cylinder lock switch input circuit shorted. Refer to the appropriate diagnostic
information.
6E Driver cylinder lock switch input circuit stuck. Refer to the appropriate diagnostic
information.
80 Incorrect odometer value found. Refer to the appropriate diagnostic
information.

81 Remote radio switch input circuit high. Refer to the appropriate diagnostic
information.
82 Remote radio switch stuck. Refer to the appropriate diagnostic
information.
A0 Internal module FLASH memory checksum failure. Refer to the appropriate diagnostic
information.
A1 Internal module bootloader failure. Refer to the appropriate diagnostic
information.
A3 Battery voltage open. Refer to the appropriate diagnostic
information.
A4 Ignition Run/Start circuit rationality. Refer to the appropriate diagnostic
information.
A5 TCCM messages not received. Refer to the appropriate diagnostic
information.
A6 Ignition Unlock circuit rationality. Refer to the appropriate diagnostic
information.
A7 VIN checksum error. Refer to the appropriate diagnostic
information.
A8 VIN previously stored. Refer to the appropriate diagnostic
information.
A9 PCI bus internal failure. Refer to the appropriate diagnostic
information.
AA PCM messages not received. Refer to the appropriate diagnostic
information.
AB TCM messages not received. Refer to the appropriate diagnostic
information.
AC ABS messages not received. Refer to the appropriate diagnostic
information.
AD FCM messages not received. Refer to the appropriate diagnostic
information.
AE ACM messages not received. Refer to the appropriate diagnostic
information.
AF SKIM messages not received. Refer to the appropriate diagnostic
information.
B0 RKE fob batteries low. Refer to the appropriate diagnostic
information.
B1 RKE module communication link. Refer to the appropriate diagnostic
information.
B2 Left Turn LED open circuit. Refer to the appropriate diagnostic
information.
B3 Left Turn LED short circuit/overtemp condition. Refer to the appropriate diagnostic
information.
B4 Right Turn LED open circuit. Refer to the appropriate diagnostic
information.
B5 Right Turn LED sshort circuit/overtemp condition. Refer to the appropriate diagnostic
information.
B6 Panel illumination open circuit. Refer to the appropriate diagnostic
information.
B7 Dome lamp open circuit. Refer to the appropriate diagnostic
information.
B8 Cargo lamp open circuit. Refer to the appropriate diagnostic
information.
B9 Door Unlock to Lock all shorted to ground. Refer to the appropriate diagnostic
information.
00 Done All Diagnostic Trouble Codes (DTC)
have been displayed.
7. The actuator test is now completed. The instrument cluster will automatically exit the self-diagnostic mode and
return to normal operation at the completion of the test, if the ignition switch is turned to the Off position during
the test, or if a vehicle speed message indicating that the vehicle is moving is received from the PCM over the
PCI data bus during the test.
8. Go back to Step 1 to repeat the test, if necessary.
Excellent advice...I will follow your tips and see what happens. Thanks again, I'll follow-up with the results.
 
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