Question about 1997 GMC Suburban

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I have a DTC code P1626 and cannot find out what the code means.

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Code p1626 in the book it says theft deterrent system fuel enable circuit. hope this helps

Posted on Aug 14, 2008

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P1626 code comes up when Vehicle is cranking to much before it fires. Like if you are turning it over for a while before it will start. And that could mean a few things but usually There is no service required according to my Snap On MODIS. Any more questions email me gethuge8@yahoo.com

Posted on Jan 08, 2009

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SOURCE: I have subarban 1999 not

Probably bad key or ignition tumbler/switch. don-ohio

Posted on Sep 13, 2011

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Posted on Jan 02, 2017

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04 corvette code P0654 and P0171 and P1626. What do the code mean. Thanks Ray


go to a different dealer these are generic obd ll codes that anyone can scan and get information also if they told you that i would ask for supervisor about it because someone is b/sing p0654
P0654 Chevrolet Engine Speed Output Circuit p0171 http://www.obd-codes.com/p0171 p1626 P1626 Chevrolet Theft Deterrent Fuel Enable Signal Not Received any of these code as you can see are available online in repair manuals etc

Jul 18, 2016 | Cars & Trucks

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How to reset Theft Deterrent fuel enable signal


have you put obd11 scanner on it to find error code.
DTC P1626 Theft Deterrent Fuel Enable Signal Lost
Circuit Description
The Vehicle Theft Deterrent (VTD) system is incorporated within the body control module (BCM). The powertrain control module(PCM) monitors the state of health serial data message from the Theft Deterrent system to ensure that the PCM to BCM communications is established. If the PCM detects a loss of the state of health message while the engine is running, DTC P1626 will set. DTC P1626 can cause a no-start condition or normal operation depending on when the loss of Theft Deterrent system communication was detected. The engine will continue to start and run if the condition that set DTC P1626 occurred after the PCM received a valid theft deterrent password from the BCM and already allowed fuel during the ignition cycle. The engine will start and immediately stall if the condition that set DTC P1626 occurred before the PCM received a valid theft deterrent password. With this condition present, the PCM will inhibit fuel delivery and disable the starter until a valid theft deterrent password is detected. Refer to Content Theft Deterrent (CTD) Circuit Description .

Conditions for Running the DTC
The Theft Deterrent system has allowed fuel delivery.
Conditions for Setting the DTC
The PCM has detected a loss of the state of health serial data message from the Theft Deterrent system.

Action Taken When the DTC Sets
The PCM stores conditions which were present when the DTC set as Failure Records only. This information will not be stored as Freeze Frame Records.

Conditions for Clearing the MIL/DTC
The DTC becomes history when the conditions for setting the DTC are no longer present.
The history DTC clears after 40 malfunction free warm-up cycles.
The PCM receives a clear code command from the scan tool.
Diagnostic Aids,
An intermittent may be caused by:

• A poor connection

• Rubbed through wire insulation

• A wire broken inside the insulation

Check for the following conditions:, • Intermittent short circuit on the serial data circuit -- Refer to Data Link Communications Operation in Data Link Communications. Be sure to check all related wiring for an intermittent short to ground or short to voltage.

• Poor connection -- Inspect the wiring harness for damage. Check for an intermittent short or open circuit in the wiring harness related to the BCM, including the ignition, battery feed, ground, and Serial Data circuits.

Mar 13, 2016 | 2001 Buick Park Avenue

1 Answer

2005. What are the probable causes of DTC P1626?


Theft deterrent system. Does the vehicle run.? That code has to do with the fuel enable circuit. Need more info.

Jan 27, 2016 | Chevrolet Malibu Cars & Trucks

1 Answer

P1626 1997 chev silverado 1500 are they fix for this problem


DTC P1626 Theft Deterrent Fuel Enable Signal Not Received
The control module communicates with other modules using the Class 2 Serial Data circuit. The vehicle theft deterrent (VTD) (Passlock) module sends a vehicle security password to the control module, via the Class 2 Serial Data circuit, after the system has sensed the proper operation of the ignition switch and lock, and determined that the switch and lock have not been tampered with. If this password matches the password stored in the control module, fuel will be enabled. If the VTD (Passlock) module does not send a password, or if the control module does not receive it, the vehicle will not start, or it may start and stall. This will set a DTC P1626 in the control module memory. If communication is lost after receiving the password, the VTD (Passlock) system will go into Fail Enable, set a U1192 in the control module, and the engine will continue to run. This will allow the engine to restart on future ignition cycles but may set a DTC P1626 as the engine is started. If the battery is disconnected or the codes are cleared, the vehicle will lose its Fail Enable status and will not start until communication is re-established
Go on YouTube an search passlock by pass , or you can take it to the dealer .

Sep 17, 2015 | Cars & Trucks

1 Answer

I have a 2000 cadillac escalade and my check engine light is on n I got codes p1345 and p1626 I changed the crankshaft sensor and now my truck won't start


DTC P1345 indicates a CKP and/or CMP position sensor problem. Probable causes:
1. Defective sensor(s)
2. Damaged or corroded connector terminal contact(s)
3. Wire harness problem. Check for correct voltage, open, short to ground, short to voltage.
4. Control unit software needs updating
5. Faulty PCM or ECM

There is no DTC 1626 for that year.

Apr 25, 2014 | Cars & Trucks

1 Answer

CODE U1000 and CODE P1626


you need obd scanner to reset and see if comes back- if it does come back with code , post again

Mar 30, 2014 | 2008 Chevrolet Suburban

1 Answer

How do you reset the security light on a 2005 chevy cobalt?


There is no reset , if security light is lit there is a problem with the anti-theft system .Should have it checked for DTC'S - diagnostic trouble codes . Could have 8 different B - codes
DTC B0685 DTC B2955 DTC B2960 DTC B3031 DTC B3033 DTC P1626 DTC P1630 DTC P1631
You would need a professional type scan tool to read these type codes , not an OBD 2 code reader .

Apr 14, 2012 | Cars & Trucks

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