P1626: Theft Deterrent Fuel Enable Signal Not Received (GM)
Severity: medium
What it means: P1626 is a GM code meaning the engine computer didn't get the 'OK to fuel' signal from the anti-theft system (Passlock or Pass-Key). Without it, the computer shuts off the fuel injectors, so the engine may start and die after a second or two.
Safe to drive? The car won't run reliably while this is happening, so the main risk is getting stranded. If it ever shuts off while driving, stop relying on it.
Common symptoms
- Starts and dies after 1–2 seconds
- Security or theft light on or flashing
- Intermittent no-start
Likely causes, ranked
- Weak battery or poor battery connectionsDIY
- Worn ignition lock cylinder or switch contactsShop
- Wiring or connector problem in the theft systemShop
- Theft-system module or engine computerShop
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Vehicle-specific notes
- 1995–2005 Pontiac Sunfire: On Car Talk, a 2001 Sunfire that started and died 30% of the time had P1626 and P1632 stored, with freeze-frame data showing the fuel pump and injectors off and a battery at 11.32 volts. Read the full answer · Source
DIY or shop?
DIY for battery and cable checks. Ignition cylinder and theft-system repairs are usually shop jobs, though GM has a relearn procedure some owners use.
Before you replace parts
- Test the battery and clean the battery cables first.
- Read all codes with a scanner that can read GM body and theft-system codes.
- Check your VIN for ignition switch recalls at nhtsa.gov/recalls.
- Have the ignition lock cylinder and Passlock sensor wiring checked before replacing the computer.
Safety / mechanic note
Verify with a mechanic. An anti-theft shutdown can leave you stranded. A code points to a circuit or system, not always a specific part.
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