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Limp mode: Codes, Causes & Fixes

Limp mode (also called reduced power or fail-safe mode) is the vehicle protecting itself: the engine or transmission computer limits power, RPM or gear selection after detecting a fault. Typical triggers are throttle pedal or throttle body faults, turbo boost problems and transmission sensor or solenoid faults. Drive gently to a safe place or a shop; restarting may clear it temporarily, but the stored codes show the real cause.

165Codes
3.3Average severity
28%High or critical
4%DIY-friendly
Severity distributionSeverity distribution

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P0299 Powertrain The turbo or supercharger isn't building the boost pressure the engine computer is asking for. Moderate P0606 Powertrain The engine computer failed its own internal self-test – check its power and grounds before… Moderate P0700 Powertrain The transmission computer found a fault and asked for the check engine light – read the TCM… Moderate P2002 Powertrain The ECU thinks the diesel particulate filter isn't trapping soot properly — or it can't measure… Moderate U0073 Network A module saw so many errors on CAN bus A that it shut off its own transmitter. High U0100 Network Another module stopped hearing from the engine computer on the CAN network. High

All codes (159)

All Severity 3+ Severity 4+
U0100 Network Another module stopped hearing from the engine computer on the CAN network. High U0101 Network The engine computer and other modules stopped hearing from the transmission control module. High U0103 Network The electronic shifter (dial, knob or joystick) stopped talking to the transmission and engine… High U0107 Network The engine computer can't reach the module that drives the electronic throttle, so power is cut… High U0110 Network The hybrid/EV system lost contact with the module that runs electric drive motor A. Critical U0115 Network Modules lost contact with the second engine computer on vehicles that use two of them. High U0401 Network The engine computer is still on the network, but another module doesn't trust the numbers it's… Moderate U0402 Network The transmission module is online, but the gear, range or torque data it sends doesn't add up. Moderate U1000 Nissan · Network A Nissan control module couldn't send or receive CAN messages for about 2 seconds or longer. Moderate

Symptoms

Check engine light on 558Loss of power 214Rough idle 184Poor fuel economy 146Engine stalling 133Car won't start 123Harsh or slipping shifts 80ABS / traction light on 65Fuel smell 34Check engine light flashing 22