GM 17 Camshaft Position Sensor Error
How to read it
Code 17 reads as 1 flash, pause, 7 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.
New to flash codes? The How to Read GM OBD-I Codes with a Paperclip walks through the test and what the numbers mean. The general OBD-I guide covers the rest.
What does GM code 17 mean?
Camshaft Position Sensor Error
Common causes of 17
- Failed cam position sensor or magnet
- Damaged sensor wiring or loose connector
- Excessive sensor air gap or debris on the sensor tip
- Faulty ignition module not passing the cam signal
How to fix 17
- Check for related crank sensor codes and diagnose those first
- Inspect sensor wiring for chafing near the timing cover
- Test sensor output with a meter while cranking per the service manual
- Verify sensor air gap and mounting before replacing it
- Clear codes and confirm the signal returns on a scan tool
Source
Qualified source review
Sources and review
Review: qualified. Read the source limits below.
- GM and Chevrolet OBD1 Trouble Codes (ALDL Fault Code List)
live reference page (troublecodes.net)
Supports: code identity and GM meaning
Fetched directly. Single publisher, so the record is qualified, not verified. Causes and check order are curator-written from the circuit the code names.
https://www.troublecodes.net/gm/
Last updated 2026-09-19.
Report a correction for 17. Include your vehicle, the issue and a source if you have one.