What causes GM code 19?

Failed crankshaft position sensor Damaged sensor wiring near the crank pulley Corroded connector or poor sensor ground Excessive air gap from a loose sensor bracket

How do I fix GM code 19?

Retrieve codes with a paperclip across ALDL pins A and B and note related codes Check for spark and injector pulse to confirm a missing crank signal Inspect wiring and connector for chafing and corrosion Test sensor resistance and output per the service manual Replace the sensor only after wiring and air gap check good

19 Crankshaft Sensor Circuit Fault

Q: What does GM code 19 mean?

GM code 19. Crankshaft Sensor Circuit Fault. Applies to 1988-1995 GM cars and C/K trucks, 3.1L and 3800 V6 models.

Make: GM (1982-1995)
Category: Powertrain - Ignition
Severity: Check Engine Light
Applies to: 1988-1995 GM cars and C/K trucks, 3.1L and 3800 V6 models

How to read it

Code 19 reads as 1 flash, pause, 9 flashes on the check-engine light. Jump terminals A and B on the ALDL connector with the key off, then turn the key on with the engine off and count the check-engine flashes.

What does GM code 19 mean?

19. Crankshaft Sensor Circuit Fault. This code sets when your vehicle computer detects crankshaft sensor circuit fault.

Common causes of 19

Failed crankshaft position sensor
Damaged sensor wiring near the crank pulley
Corroded connector or poor sensor ground
Excessive air gap from a loose sensor bracket

How to fix 19

Retrieve codes with a paperclip across ALDL pins A and B and note related codes
Check for spark and injector pulse to confirm a missing crank signal
Inspect wiring and connector for chafing and corrosion
Test sensor resistance and output per the service manual
Replace the sensor only after wiring and air gap check good