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 distribution
Most viewed
P0299
Powertrain
The turbo or supercharger isn't building the boost pressure the engine computer is asking for.
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
P0606
Powertrain
The engine computer failed its own internal self-test – check its power and grounds before…
Moderate
All codes (165)
P246C
Powertrain
The DPF is so restricted that the ECM has cut engine power to protect the turbo, EGR system…
High
P2714
Powertrain
Transmission pressure solenoid D isn't regulating pressure as commanded – a classic source…
Moderate
P2716
Powertrain
The transmission computer sees an open or short in the circuit of pressure control solenoid D.
Moderate
P2BAC
Powertrain
EGR has been shut off because of a fault, so NOx is above the limit; fix the EGR code stored…
Moderate
U0001
Network
A module found the high-speed CAN network itself misbehaving, not just one silent module.
High
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
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