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Discussion Starter · #1 ·
The check engine light comes on about every two weeks with code P26A9. I have checked on line for information and cannot find what this code is for. Driving me nuts. Would like any information possible to stop this code from coming back. Thanks
 

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2011 Ram 2500 4x4 6.7 68RFE 4 inch lift
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Found this for ya.

What Does the P26A9 Code Mean?
The passenger compartment heater coolant control valve regulates the engine coolant flow into the cabin heater loop depending on engine coolant temperature and ambient temperature conditions. The passenger compartment heater coolant control valve has two positions: ByPass or Link. In the ByPass position, the coolant in the engine loop and heater loop are separated and in the link position the coolant circulates through both loops. The valve movement is controlled by a PWM signal. A 50% duty cycle is a normal duty cycle. A 75% duty cycle represents a valve commanded to the link position. A 25% duty cycle represents a valve commanded to the ByPass position. The passenger compartment heater coolant control valve uses an internal position sensor that sends a signal to the hybrid powertrain control module to determine the valve position.
When the engine coolant temperature heats up, a valve learn procedure takes place. The hybrid powertrain control module 2 commands the valve to the link position and records the voltage coming back from the position sensor. Then the hybrid powertrain control module 2 commands the valve back to the bypass position and records the voltage coming back from the position sensor. The voltage values in both the link and bypass positions must fall within calibrated ranges.
 

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A truck I about can't afford to drive
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A few things can cause it
Faulty Coolant Three-Way Valve Sensor.
Coolant Three Way Valve Sensor harness is open or shorted.
Coolant Three Way Valve Sensor circuit poor electrical connection.
Faulty Powertrain Control Module (PCM).

You just need to figure out which one.
Try inspecting the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.
Other than that, not sure
 

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Discussion Starter · #6 ·
View attachment 958487


A few things can cause it
Faulty Coolant Three-Way Valve Sensor.
Coolant Three Way Valve Sensor harness is open or shorted.
Coolant Three Way Valve Sensor circuit poor electrical connection.
Faulty Powertrain Control Module (PCM).

You just need to figure out which one.
Try inspecting the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.
Other than that, not sure
Thank you for the information. I will check it out.
 
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