P0726 code meaning
Engine Speed Input Circuit Range/Performance
Powertrain system Generic code P07xx codes Check engine light
What P0726 means
The transmission module needs engine speed for converter slip, shift quality and to check the turbine speed. Today it almost always arrives over CAN from the engine module with a validity flag; only GM's 2007 Allison 1000 tables show a separate engine speed sensor read by the transmission module. P0726 means the engine speed value is present but implausible. The Allison 1000, which reads its own sensor, flags a jump of 600 rpm within 0.15 s or noise of ±650 rpm, with the engine above 600 rpm and a gear engaged, after two trips. Saab's 9-3 of 2000, which receives the value over the bus, flags more than 7200 rpm for at least 10 s. The converter clutch is then locked out and shifts may be harsh. No signal at all is P0727.
P0726 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 2 hours
- Clears after repairAfter a drive cycle
Symptoms of P0726
- Transmission warning lamp, possibly check engine light
- Torque converter clutch locked out
- Harsh shifts or limp mode
- Often an engine code (crankshaft sensor) as well
Common causes of P0726
- Most likelyEngine speed sensor at the transmission (Allison) dirty or faulty, loose contact
- PossibleInterference (shielding, ground)
- PossibleWrong bus value from the engine module (crankshaft sensor problem)
- Less likelyTransmission module
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Engine speed signalCAN busTransmission control module
What each part of P0726 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 7 | Area: transmission. |
| 26 | The exact fault in that area. |
What to do next
- Note P0726 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 P0726
What does P0726 mean?
P0726 means "Engine Speed Input Circuit Range/Performance". The transmission module needs engine speed for converter slip, shift quality and to check the turbine speed. It is a generic code, so it means the same on every make.
Is it safe to drive with P0726?
Drive gently and only to a workshop. With P0726 the car can go into limp mode (reduced power) to protect itself.
Will P0726 fail an emissions test?
Yes, it can. P0726 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 P0726 to fix?
Difficulty: medium. A typical repair takes 0.5 to 2 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P0726 clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.