P276C
Electric/Auxiliary Transmission Fluid Pump B Motor Supply Voltage Circuit High
The motor supply voltage of the second auxiliary transmission fluid pump is above the operating range.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: medium
Symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
Common causes
Ordered by how often each turns out to be the cause.
- Alternator regulator failed to limit outputCommon
- Wiring shorted to a higher-voltage circuitLess likely
- Connector pins corroded - high contact resistanceLess likely
Parts involved
- Aux Trans Pump B
- Supply Circuit
- Charging System
P276C is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.