What does code P2688 mean?

Q: What does code P2688 mean?

Fuel Supply Heater Control Circuit Low. P2688 indicates that the powertrain control module (PCM) has detected a low-voltage condition on the control circuit for the fuel supply heater, which is typically a fuel temperature or fuel line heater used to prevent waxing or improve cold-start performance. The PCM commands the heater on and monitors the circuit, and it sets this code when the voltage on the control side is lower than expected, indicating a short to ground or an open circuit.

DTC codes / P26xx · Computer and output circuits / P2688

P2688Fuel Supply Heater Control Circuit Low

P2688 indicates that the powertrain control module (PCM) has detected a low-voltage condition on the control circuit for the fuel supply heater, which is typically a fuel temperature or fuel line heater used to prevent waxing or improve cold-start performance. The PCM commands the heater on and monitors the circuit, and it sets this code when the voltage on the control side is lower than expected, indicating a short to ground or an open circuit.

SystemPowertrain

Code typeGeneric (all makes)

SeverityLow

Fix difficultyIntermediate

AreaComputer and output circuits

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.