code 1626
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bonnechuck
- LE Member
- Posts: 7
- Joined: Mon Jun 27, 2011 9:21 pm
- Year and Trim: 2000 SE
code 1626
Gentlemen your help would be greatly appreciated. 2000 se starts, runs at idle and revs. But put in gear stalls, I assume fuel pump is being shut down. Towed twice this week. My mechanic says code 1626 and cannot fix it. I can wrench and if possible would like to fix it myself. Thanks in advance for your help. Bonnechuck.
Re: code 1626
have you tried a different key? if it needs a part, contact harofreak00 he can help if you need a part.
P1626
Description
THEFT DETERRENT SYSTEM FUEL ENABLE CIRCUIT
Vehicle operation is disabled if incorrect key or starting
procedure is used. Theft deterrent module enables crank circuit to
starter and sends a signal to PCM if correct key is being used. If
proper signal does not reach PCM fuel enable signal circuit, PCM will
not pulse injectors on, disabling vehicle, even if crank circuit is
by-passed. Signal should be 40-60 Hz and is measured using DVOM in
Hertz scale.
Symptoms
Engine will not run
Causes
PCM detects incorrect signal on Theft Deterrent System (TDS)
fuel enable circuit.
Solutions
Check for faulty connection at TDS module.
Replace VTD module.
P1626
Description
THEFT DETERRENT SYSTEM FUEL ENABLE CIRCUIT
Vehicle operation is disabled if incorrect key or starting
procedure is used. Theft deterrent module enables crank circuit to
starter and sends a signal to PCM if correct key is being used. If
proper signal does not reach PCM fuel enable signal circuit, PCM will
not pulse injectors on, disabling vehicle, even if crank circuit is
by-passed. Signal should be 40-60 Hz and is measured using DVOM in
Hertz scale.
Symptoms
Engine will not run
Causes
PCM detects incorrect signal on Theft Deterrent System (TDS)
fuel enable circuit.
Solutions
Check for faulty connection at TDS module.
Replace VTD module.
Shane "RedZMonte"
2004 Z16 Z06: Virgin
2000 SSEi: Kenwood DDX512, 3.25" MPS, ZZP DP, PLog, Puck Mount, NGK TR7's, DHP Tuned
1995 Monte Z34: T04e "60" turbo, 42.5# injectors, Borla Catback, OBDII swap, DHP Tuned, Much more...
2004 Z16 Z06: Virgin
2000 SSEi: Kenwood DDX512, 3.25" MPS, ZZP DP, PLog, Puck Mount, NGK TR7's, DHP Tuned
1995 Monte Z34: T04e "60" turbo, 42.5# injectors, Borla Catback, OBDII swap, DHP Tuned, Much more...
- Archon
- Resident Gearhead

- Posts: 8781
- Joined: Mon May 19, 2008 10:30 pm
- Year and Trim: 2014 Cadillac XTS Vsport.
- Location: Grand Rapids, Michigan
Re: code 1626
If it runs, the problem is not being caused by that code. It can fail in 2 states. One where the car will start, run, and drive fine. The other where it will not even start. Is the security light on? Have you checked fuel pressure? Any other codes? Disconnected the MAF to see how it runs? Checked for large vacuum leaks?
*Gone, but not forgotten* - Black 2000 SSEi, HIR Headlights, Angel Eyes fogs, 3rd brake light overlay, hi-flo cat, 180 degree thermostat, HS 1.9 rockers, LSx yellow springs, Intense FWI, PCM, shift kit, push rods, and 3.4 Pulley. ZZP Power Log.
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bonnechuck
- LE Member
- Posts: 7
- Joined: Mon Jun 27, 2011 9:21 pm
- Year and Trim: 2000 SE
Re: code 1626
Thanks for your help. Where is TDS module? Of course I will contact Harofreak00 if I need parts. Bonnechuck.


