P26A7 code meaning
Engine Coolant Bypass Valve A Position Sensor Circuit High
Powertrain system Generic code P26xx codes Check engine light
What P26A7 means
The counterpart to P26A6: the feedback from valve A reads too high. GM's 2016 Volt table counts both a signal above its window and a broken signal circuit here, because an interrupted wire lets the input float toward the reference. The limit is 95 % of the reference (4.75 V), checked as 40 failures in 50 samples at 100 ms, Type B. The 2011 Volt table uses the same 95 % rule but prints the voltage as 4.25 V. Subaru's correction bulletin 09-132-25 also covers P26A7 for its boxer engines and again drops the first step of the published test. Subaru's earlier bulletin 09-80-21 replaced the thermo control valve with a better sealed sensor section. Check for a broken signal or ground wire and for a short to the 5 V supply before condemning the valve.
P26A7 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 P26A7
- Check engine light
- Scan tool shows valve position at maximum
- Engine slow to reach operating temperature
Common causes of P26A7
- Most likelyOpen feedback or sensor ground wire
- PossibleFeedback wire shorted to 5 V reference or battery voltage
- PossibleDefective sensor in the valve housing
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 P26A7 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. |
| A7 | The exact fault in that area. |
What to do next
- Note P26A7 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 P26A7
What does P26A7 mean?
P26A7 means "Engine Coolant Bypass Valve A Position Sensor Circuit High". The counterpart to P26A6: the feedback from valve A reads too high. It is a generic code, so it means the same on every make.
Is it safe to drive with P26A7?
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 P26A7 fail an emissions test?
Yes, it can. P26A7 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 P26A7 to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will P26A7 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.