Loss of power: Codes, Causes & Fixes
Noticeable loss of power usually has one of a few causes: the engine computer has entered limp mode, a turbocharged engine is underboosting (P0299), airflow is restricted by a dirty MAF sensor or clogged air filter, fuel pressure is low, or the exhaust is blocked by a failing catalytic converter or full diesel particulate filter. Read all stored codes and freeze-frame data first – they usually show which of these paths to follow.
214Codes
3.1Average severity
22%High or critical
9%DIY-friendly
Severity distribution
Most viewed
P0174
Powertrain
The cylinder bank without cylinder 1 is running lean even with the maximum fuel correction…
Moderate
P0420
Powertrain
The bank 1 catalytic converter no longer stores enough oxygen to clean the exhaust properly.
Low
P0101
Powertrain
The MAF sensor's airflow reading doesn't match what the engine computer expects…
Low
P0171
Powertrain
The engine computer is adding the maximum extra fuel it's allowed on bank 1 and still sees…
Moderate
P0299
Powertrain
The turbo or supercharger isn't building the boost pressure the engine computer is asking for.
Moderate
P0300
Powertrain
The engine computer sees misfires that jump between cylinders or hit several cylinders at once.
High
All codes (214)
U0107
Network
The engine computer can't reach the module that drives the electronic throttle, so power is cut…
High
U0109
Network
The PCM lost contact with the module that controls fuel pump speed; stalling or no-start can…
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