Diagnostic library

Find an OBD2 code

Search the code from your scanner, then narrow the library by system, severity, or code family.

9,253 diagnostic guides

Sort

Find codes by symptomChoose what you notice to search matching code guides.

Rough idle or shakingVibration while stopped Hard to startLong cranking or no-start Engine stallsCuts out at idle or on the road Hesitates or loses powerSlow response when accelerating Battery light is onCharging system warning Harsh gear changesDelayed or rough shifting

A symptom can have several causes. Treat matching codes as clues and follow the diagnostic checks in each guide.

Check soon P · Powertrain Clear all

Quick browse

Choose a vehicle system

Engine1049 Emissions515 Fuel1016 Sensors & Electronics2110 Transmission866 Electrical & Charging1797 Body & Restraints193 Chassis & Brakes479 Network & Communication1228

FiltersSeverity · family

Severity

All severities9253 Low priority305 Check soon8256 Urgent621

Code family

All families9253 P · Powertrain7353 B · Body193 C · Chassis479 U · Network1228

Vehicle coverage

These are generic OBD2 definitions. Exact make, model, engine, and year compatibility will appear after vehicle-fitment data is added.

Diagnostic codes

Showing 673–696 of 6682

Most searched first

P0373Timing Reference High Resolution Signal A Intermittent/Erratic PulsesCheck soonEngine Problems30–120 minutes for initial diagnosisP0373 relates to timing reference high resolution signal a intermittent/erratic pulses. Check the fault conditions and vehicle-specific procedure before replacing parts.P0374Timing Reference High Resolution Signal A No PulsesCheck soonEngine Problems30–120 minutes for initial diagnosisP0374 relates to timing reference high resolution signal a no pulses. Check the fault conditions and vehicle-specific procedure before replacing parts.P0375Timing Reference High Resolution Signal BCheck soonEngine Problems30–120 minutes for initial diagnosisP0375 relates to timing reference high resolution signal b. Check the fault conditions and vehicle-specific procedure before replacing parts.P0376Timing Reference High Resolution Signal B Too Many PulsesCheck soonEngine Problems30–120 minutes for initial diagnosisP0376 relates to timing reference high resolution signal b too many pulses. Check the fault conditions and vehicle-specific procedure before replacing parts.P0377Timing Reference High Resolution Signal B Too Few PulsesCheck soonEngine Problems30–120 minutes for initial diagnosisP0377 relates to timing reference high resolution signal b too few pulses. Check the fault conditions and vehicle-specific procedure before replacing parts.P0378Timing Reference High Resolution Signal B Intermittent/Erratic PulsesCheck soonEngine Problems30–120 minutes for initial diagnosisP0378 relates to timing reference high resolution signal b intermittent/erratic pulses. Check the fault conditions and vehicle-specific procedure before replacing parts.P0379Timing Reference High Resolution Signal B No PulsesCheck soonEngine Problems30–120 minutes for initial diagnosisP0379 relates to timing reference high resolution signal b no pulses. Check the fault conditions and vehicle-specific procedure before replacing parts.P037AGlow Plug/Heater Indicator Control Circuit LowCheck soonSensors & Electronics30–120 minutes for initial diagnosisP037A relates to glow plug/heater indicator control circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P037BGlow Plug/Heater Indicator Control Circuit HighCheck soonSensors & Electronics30–120 minutes for initial diagnosisP037B relates to glow plug/heater indicator control circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P037CCold Start Camshaft Profile System PerformanceCheck soonEngine Problems30–120 minutes for initial diagnosisP037C relates to cold start camshaft profile system performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P037DGlow Plug Sense CircuitCheck soonSensors & Electronics30–120 minutes for initial diagnosisP037D relates to glow plug sense circuit. Check the fault conditions and vehicle-specific procedure before replacing parts.P037EGlow Plug Sense Circuit LowCheck soonSensors & Electronics30–120 minutes for initial diagnosisP037E relates to glow plug sense circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P037FGlow Plug Sense Circuit HighCheck soonSensors & Electronics30–120 minutes for initial diagnosisP037F relates to glow plug sense circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P0380Glow Plug/Heater Circuit ACheck soonSensors & Electronics30–120 minutes for initial diagnosisP0380 relates to glow plug/heater circuit a. Check the fault conditions and vehicle-specific procedure before replacing parts.P0381Glow Plug/Heater Indicator Control Circuit/OpenCheck soonSensors & Electronics30–120 minutes for initial diagnosisP0381 relates to glow plug/heater indicator control circuit/open. Check the fault conditions and vehicle-specific procedure before replacing parts.P0382Glow Plug/Heater Circuit BCheck soonSensors & Electronics30–120 minutes for initial diagnosisP0382 relates to glow plug/heater circuit b. Check the fault conditions and vehicle-specific procedure before replacing parts.P0383Glow Plug Control Module 1 Control Circuit LowCheck soonSensors & Electronics30–120 minutes for initial diagnosisP0383 relates to glow plug control module 1 control circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P0384Glow Plug Control Module 1 Control Circuit HighCheck soonSensors & Electronics30–120 minutes for initial diagnosisP0384 relates to glow plug control module 1 control circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P0385Crankshaft Position Sensor B CircuitCheck soonEngine Problems30–120 minutes for initial diagnosisP0385 relates to crankshaft position sensor b circuit. Check the fault conditions and vehicle-specific procedure before replacing parts.P0386Crankshaft Position Sensor B Circuit Range/PerformanceCheck soonEngine Problems30–120 minutes for initial diagnosisP0386 relates to crankshaft position sensor b circuit range/performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P0387Crankshaft Position Sensor B Circuit LowCheck soonEngine Problems30–120 minutes for initial diagnosisP0387 relates to crankshaft position sensor b circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P0388Crankshaft Position Sensor B Circuit HighCheck soonEngine Problems30–120 minutes for initial diagnosisP0388 relates to crankshaft position sensor b circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P0389Crankshaft Position Sensor B Circuit IntermittentCheck soonEngine Problems30–120 minutes for initial diagnosisP0389 relates to crankshaft position sensor b circuit intermittent. Check the fault conditions and vehicle-specific procedure before replacing parts.P038AIgnition I Control Signal Circuit/OpenCheck soonSensors & Electronics30–120 minutes for initial diagnosisP038A relates to ignition i control signal circuit/open. Check the fault conditions and vehicle-specific procedure before replacing parts.