P26A6 code meaning
Engine Coolant Bypass Valve A Position Sensor Circuit Low
Powertrain system Generic code P26xx codes Check engine light
What P26A6 means
P26A6 means the valve A feedback voltage has dropped below its plausible floor, typically from a short to ground, a lost reference voltage or a failed sensor. GM sets it on the Volt (2011 HPC2/VICM and 2016 VICM) once the signal falls under 5 % of reference, about 0.25 V, in 40 of 50 samples at 100 ms; it is Type B, so the lamp comes on after two trips. Subaru issued a service manual correction for P26A6 (09-132-25: Forester from 2019, Outback/Legacy from 2020, Impreza/Crosstrek from 2021) telling technicians to skip the first diagnostic step. On 2022–2023 Ram 1500 trucks with the 3.6 L V6, bulletin 07-005-24 links P26A6 to a cracked gear and swaps the three-way coolant valve, a job of about 0.7 h.
P26A6 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.5 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P26A6
- Check engine light
- Delayed warm-up or reduced heater output
- Valve position shown at or near zero on the scan tool
Common causes of P26A6
- Most likelyFeedback wire chafed through and shorted to ground
- PossibleOpen 5 V reference supply to the sensor
- PossibleInternal sensor failure, e.g. after coolant intrusion
- Less likelyCracked valve gear (Ram 3.6 L, 07-005-24)
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Coolant bypass valve aPosition sensorWiring harness
What each part of P26A6 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 6 | Area: computer (engine control module) and output circuits. |
| A6 | The exact fault in that area. |
What to do next
- Note P26A6 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P26A6
What does P26A6 mean?
P26A6 means "Engine Coolant Bypass Valve A Position Sensor Circuit Low". P26A6 means the valve A feedback voltage has dropped below its plausible floor, typically from a short to ground, a lost reference voltage or a failed sensor. It is a generic code, so it means the same on every make.
Is it safe to drive with P26A6?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P26A6 fail an emissions test?
Yes, it can. P26A6 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P26A6 to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will P26A6 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.