Search

Learn what P0537 means and how to diagnose high input from the A/C refrigerant temperature sensor P0537 Overview Code P0537 Code Type P Code Class P0 System A/C Severity Level Medium Emissions Related false Drivability Impact Minor Diagnostic Protocol OBD2 Freeze Frame Useful true Code Definition Diagnostic trouble code P0537 indicates high input from the A/C refrigerant temperature sensor Symptoms Insufficient cooling Overview applies to this diagnostic code. Affected Systems On This Page Code Definition Symptoms Affected Systems Possible Causes Diagnostic Steps Drive Safety Notes More Resources Diagnostic Trouble Codes Diagnostic Q&A Automotive Knowledge Base All Diagnostic Products A/C system temperature monitoring Possible Causes Overcharged refrigerant; Faulty refrigerant temperature sensor Diagnostic Steps 1 Check refrigerant level 2 Test refrigerant temperature sensor Drive Safety Notes Inadequate cooling performance

Learn what P2120 means and how to diagnose throttle position sensor circuit faults P2120 Overview Code P2120 Code Type P Code Class P0 System Engine Severity Level Medium Emissions Related false Drivability Impact Major Diagnostic Protocol OBD2 Freeze Frame Useful true Code Definition Diagnostic trouble code P2120 indicates a malfunction in the throttle position sensor circuit Symptoms Hesitation Overview applies to this diagnostic code. Affected Systems On This Page Code Definition Symptoms Affected Systems Possible Causes Diagnostic Steps Drive Safety Notes More Resources Diagnostic Trouble Codes Diagnostic Q&A Automotive Knowledge Base All Diagnostic Products Throttle position monitoring Possible Causes TPS failure Diagnostic Steps 1 Monitor TPS signal; 2 Inspect wiring Drive Safety Notes Throttle response inconsistent

Learn what P0626 means and how to diagnose fuel rail pressure sensor circuit faults P0626 Overview Code P0626 Code Type P Code Class P0 System Engine Severity Level Medium Emissions Related true Drivability Impact Major Diagnostic Protocol OBD2 Freeze Frame Useful true Code Definition Diagnostic trouble code P0626 indicates a malfunction in the fuel rail pressure sensor circuit Symptoms Poor acceleration; Check Engine Light Overview applies to this diagnostic code. Affected Systems On This Page Code Definition Symptoms Affected Systems Possible Causes Diagnostic Steps Drive Safety Notes More Resources Diagnostic Trouble Codes Diagnostic Q&A Automotive Knowledge Base All Diagnostic Products Fuel rail pressure sensor Possible Causes Faulty fuel rail pressure sensor; Wiring issues Diagnostic Steps 1 Inspect fuel rail pressure sensor 2 Test sensor output Drive Safety Notes Fuel delivery may be unstable, affecting engine performance

Learn what P0722 means and how to diagnose output speed sensor no signal faults P0722 Overview Code P0722 Code Type P Code Class P0 System Transmission Severity Level High Emissions Related false Drivability Impact Major Diagnostic Protocol OBD2 Freeze Frame Useful true Code Definition Diagnostic trouble code P0722 indicates no signal from the output speed sensor Symptoms Transmission stuck in gear Overview applies to this diagnostic code. Affected Systems On This Page Code Definition Symptoms Affected Systems Possible Causes Diagnostic Steps Drive Safety Notes More Resources Diagnostic Trouble Codes Diagnostic Q&A Automotive Knowledge Base All Diagnostic Products Vehicle speed feedback Possible Causes Sensor open circuit Diagnostic Steps 1 Inspect sensor connector 2 Test signal output Drive Safety Notes Speed data unavailable

Learn what P0405 means, symptoms, causes, and diagnostic steps for low EGR position sensor input P0405 Overview Code P0405 Code Type P Code Class P0 System Engine, Emissions Severity Level Medium Emissions Related true Drivability Impact Minor Diagnostic Protocol OBD2 Freeze Frame Useful true Code Definition Diagnostic trouble code P0405 indicates low input from the EGR position sensor Symptoms Check Engine Light illuminated; Rough idle Overview applies to this diagnostic code. Affected Systems On This Page Code Definition Symptoms Affected Systems Possible Causes Diagnostic Steps Drive Safety Notes More Resources Diagnostic Trouble Codes Diagnostic Q&A Automotive Knowledge Base All Diagnostic Products EGR valve feedback control and emissions regulation Possible Causes Wiring short to ground; Faulty EGR position sensor; EGR valve issues Diagnostic Steps 1 Inspect sensor wiring for shorts; 2 Test sensor voltage; 3 Inspect EGR valve operation; 4 Replace sensor if needed Drive Safety Notes Driving is possible but EGR function is impaired

Learn what P0646 means and how to diagnose fuel pressure sensor circuit issues P0646 Overview Code P0646 Code Type P Code Class P0 System Engine Severity Level Medium Emissions Related true Drivability Impact Major Diagnostic Protocol OBD2 Freeze Frame Useful true Code Definition Diagnostic trouble code P0646 indicates a malfunction in the fuel pressure sensor circuit Symptoms Poor fuel economy; Engine misfire Overview applies to this diagnostic code. Affected Systems On This Page Code Definition Symptoms Affected Systems Possible Causes Diagnostic Steps Drive Safety Notes More Resources Diagnostic Trouble Codes Diagnostic Q&A Automotive Knowledge Base All Diagnostic Products Fuel pressure sensor Possible Causes Faulty fuel pressure sensor; Wiring issues Diagnostic Steps 1 Inspect fuel pressure sensor 2 Test sensor output Drive Safety Notes Inconsistent fuel pressure may impair vehicle performance

Learn what P0765 means and how to diagnose shift solenoid C performance malfunctions P0765 Overview Code P0765 Code Type P Code Class P0 System Transmission Severity Level High Emissions Related true Drivability Impact Major Diagnostic Protocol OBD2 Freeze Frame Useful true Code Definition Diagnostic trouble code P0765 indicates a malfunction in the shift solenoid C performance Symptoms Harsh shifting Poor acceleration Overview applies to this diagnostic code. Affected Systems On This Page Code Definition Symptoms Affected Systems Possible Causes Diagnostic Steps Drive Safety Notes More Resources Diagnostic Trouble Codes Diagnostic Q&A Automotive Knowledge Base All Diagnostic Products Shift solenoid C Possible Causes Faulty shift solenoid C Electrical or solenoid wiring issues Diagnostic Steps 1 Inspect shift solenoid C2 Test solenoid performance Drive Safety Notes Malfunctions in solenoid C affect vehicle acceleration and shifting behavior

Learn what P0320 means, symptoms, causes, and diagnostic steps for knock sensor circuit faults P0320 Overview Code P0320 Code Type P Code Class P0 System Engine Severity Level High Emissions Related true Drivability Impact Major Diagnostic Protocol OBD2 Freeze Frame Useful true Code Definition Diagnostic trouble code P0320 indicates a malfunction in the knock sensor circuit Symptoms Engine knocking; Reduced power; Poor fuel economy Overview applies to this diagnostic code. Affected Systems On This Page Code Definition Symptoms Affected Systems Possible Causes Diagnostic Steps Drive Safety Notes More Resources Diagnostic Trouble Codes Diagnostic Q&A Automotive Knowledge Base All Diagnostic Products Ignition timing control and engine protection Possible Causes Faulty knock sensor; Wiring issues; ECM fault Diagnostic Steps 1 Inspect knock sensor wiring and connectors; 2 Test knock sensor resistance; 3 Monitor knock sensor data during engine load; 4 Replace sensor if faulty Drive Safety Notes Engine knocking may cause internal damage Avoid high load

Learn what P0606 means and how to diagnose ECM processor circuit faults P0606 Overview Code P0606 Code Type P Code Class P0 System Engine Severity Level High Emissions Related false Drivability Impact Major Diagnostic Protocol OBD2 Freeze Frame Useful true Code Definition Diagnostic trouble code P0606 indicates a malfunction in the ECM’s processor circuit Symptoms Check Engine Light; Engine misfire Overview applies to this diagnostic code. Affected Systems On This Page Code Definition Symptoms Affected Systems Possible Causes Diagnostic Steps Drive Safety Notes More Resources Diagnostic Trouble Codes Diagnostic Q&A Automotive Knowledge Base All Diagnostic Products Engine Control Module (ECM) Possible Causes Failed ECM processor; Wiring issues Diagnostic Steps 1 Inspect wiring 2 Test ECM processor Drive Safety Notes Engine control may be severely impacted

P0114 code explained Learn symptoms, causes, and diagnostic steps for an intermittent intake air temperature sensor signal P0114 Overview Code P0114 Code Type P Code Class P0 System Engine Severity Level Low Emissions Related true Drivability Impact Minor Diagnostic Protocol OBD2 Freeze Frame Useful true Code Definition Diagnostic trouble code P0114 indicates an intermittent or erratic signal from the intake air temperature (IAT) sensor circuit Symptoms Intermittent Check Engine Light; Hesitation or surging; Rough idle Overview applies to this diagnostic code. Affected Systems On This Page Code Definition Symptoms Affected Systems Possible Causes Diagnostic Steps Drive Safety Notes More Resources Diagnostic Trouble Codes Diagnostic Q&A Automotive Knowledge Base All Diagnostic Products Intermittent IAT sensor signals can cause unstable fuel delivery and inconsistent engine performance Possible Causes Loose wiring or connectors; Failing IAT sensor; Vibration-related electrical faults Diagnostic Steps 1 Scan for intermittent fault codes; 2 Inspect wiring and connectors; 3 Perform a wiggle test while monitoring live data; 4 Check sensor mounting and intake area; 5 Replace the IAT sensor if intermittent issues persist Drive Safety Notes Intermittent performance issues may occur Repair is recommended to prevent drivability problems

Learn what P0621 means and how to diagnose alternator field control circuit issues P0621 Overview Code P0621 Code Type P Code Class P0 System Engine Severity Level High Emissions Related false Drivability Impact Major Diagnostic Protocol OBD2 Freeze Frame Useful true Code Definition Diagnostic trouble code P0621 indicates an issue with the alternator field control circuit Symptoms Battery light on; Difficulty starting Overview applies to this diagnostic code. Affected Systems On This Page Code Definition Symptoms Affected Systems Possible Causes Diagnostic Steps Drive Safety Notes More Resources Diagnostic Trouble Codes Diagnostic Q&A Automotive Knowledge Base All Diagnostic Products Alternator field control circuit Possible Causes Faulty alternator; Wiring issue Diagnostic Steps 1 Inspect alternator field control circuit 2 Test alternator output Drive Safety Notes Alternator issues can result in loss of electrical power