In order to determine if the gear change has occurred in the appropriate amount of time, the computer will look at the data from the input speed sensor and output speed sensor. If the result is not line up with predetermined parameters, a P2703 DTC will be set.
How Serious is the Code?
The P2703 diagnostic trouble code can indicate a number of things. For example, the transmission fluid can be excessively dirty or low, the OSS sensor/ISS sensor may have failed, or the transmission pump may be failing. Either way, this is a fairly serious trouble code to have.
Symptoms of a P2703 include:
- Unusually harsh gear changes
- Failure to shift gears
- Limp mode
- Transmission fluid is below acceptable levels
- Dirty transmission fluid/filter
- Damaged wiring/connectors
- Faulty transmission pump
- Overheating the transmission
- Faulty TCM
- Faulty input speed sensor/output speed sensor
How to Diagnose the Code?
Transmission fluid is the lifeblood of your gearbox, and it should be the first thing that is considered when trying to diagnose a P2703 OBDII diagnostic trouble code. Low transmission fluid levels or dirty transmission fluid can cause this code to set. Transmission fluid leaks can also cause a lack of hydraulic pressure, which can lead to the same code. Should no issues be found, then the wiring harness should be carefully examined for signs of damage to the wires or corrosion in the connectors. If no transmission problems are found up to this point, then the ISS sensor, OSS sensor, and transmission pump need to be examined.
What Repairs Will Fix P2703?
- Change the transmission fluid/filter
- Repair transmission fluid leaks
- Repair damage wiring/connectors
- Install new transmission pump
- Install new TCM
- Install new output speed sensor/input speed sensor
- Install remanufactured transmission
P2700 – Transmission Friction Element A Apply Time Range/Performance
P2701 – Transmission Friction Element B Apply Time Range/Performance
P2702 – Transmission Friction Element C Apply Time Range/Performance
P2704 – Transmission Friction Element E Apply Time Range/Performance
P2705 – Transmission Friction Element F Apply Time Range/Performance