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Why does the gmc get to 35 miles an hour then go into limp mode with no codes

There has to be codes. You need a better code reader. Go to a GMC dealership. They will read the codes in the hope of getting the business.

Have a read of the link

gmc get to 35 miles an hour then go into limp mode with no codes Google...

Mar 22, 2017 | GMC Cars & Trucks

1 Answer

2008 impala no tach signal to pcm

DTC P0651: 5-Volt Reference 2 Circuit
You have a bad sensor or a short on the five ref. circuit .
The 5-volt reference 2 buss provides 5 volts to the following sensors:
The APP sensor 1

The crankshaft position (CKP) sensor

The throttle position (TP) sensor 1 and 2

The brake booster vacuum sensor

A bad sensor or short on the five volt ref. circuit will bring down the PCM and you will have a no start . I would pull the connectors off each of these sensors listed above to see if five volt ref. comes back to five volts . Well first check five volt ref at easiest sensor to get to . watch this video , he explains better !

2006 Cadillac DTS Shorted 5v Reference Circuit

Dec 05, 2016 | Cars & Trucks

1 Answer

What are the probable causes of DTC P0651?

Dec 12, 2015 | 2008 Chevrolet Chevrolet TrailBlazer LT

2 Answers

My 2003 chevy pickup starts up then stops running almost instantly and will not run it has a 4'3 engine and has a dtc p0651 code in it could you tell me how to fix the problem?

You have a short on PCM - powertrain control module , 5volt reference circuit . This will surely make the vehicle not keep running !
The powertrain control module (PCM) provides 5 volts to the following sensors:
The air conditioning (A/C) pressure sensor

The fuel tank pressure (FTP) sensor, if equipped

These 5-volt reference circuits are independent of each other outside the PCM, but are bussed together inside the PCM. Therefore a circuit condition on one sensor 5-volt reference circuit may affect the other sensor 5-volt reference circuits. The PCM monitors the voltage on the 5-volt reference circuit. If the PCM detects that the voltage is out of tolerance, DTC P0651 sets.

Aug 30, 2015 | Cars & Trucks

1 Answer

I'm getting code PO300. Drove fine to work, going home it ran horrible.

P0300 GMC -
OBD-II Trouble Codes Definition, Description and Repair Information ' Engine-Codes. Engine- ... 2000-2008 GMC Yukon XL ... 2002 Chevrolet Blazer P0300 Misfire Diagnostics ... 2008 GMC ENVOY Engine And Engine Cooling:engine Details.

Jul 14, 2015 | GMC 2002 Envoy XL SLT

1 Answer

Chevy colorado

Hi there:

DTC P0641 - 5-Volt Reference 1 Circuit

DTC P0651 - 5-Volt Reference 2 Circuit

Diagnostic Fault Information
Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

Circuit/System Description
The engine control module (ECM) has 2 internal 5-volt reference busses called 5-volt reference 1 and 5-volt reference 2. Each reference bus provides 5-volt reference circuits for more than one sensor. Therefore, a fault condition on one 5-volt reference circuit will affect the other 5-volt reference circuits connected to that reference bus. The ECM monitors the voltage on the 5-volt reference busses.

The 5-volt reference 1 bus provides 5 volts to the following sensors:
* The manifold absolute pressure (MAP) sensor
* The fuel tank pressure (FTP) sensor
* The air conditioning (A/C) refrigerant pressure sensor
* The accelerator pedal position (APP) sensor 2
* The intake camshaft position (CMP) sensor

The 5-volt reference 2 bus provides 5 volts to the following sensors:
* The APP sensor 1
* The throttle position (TP) sensor 1 and 2
* The crankshaft position (CKP) sensor

Conditions for Running the DTC
* DTCs P0601, P0602, P0603, P0604, P0605, P0606, P0607, and P2610 are not set.
* The ignition is in Unlock, Accessory, Run, or Crank.
* The ignition voltage is more than 5.23 volts.
* DTCs P0641 and P0651 run continuously when the above conditions are met.

Conditions for Setting the DTC
The ECM detects a voltage out of tolerance condition on the 5-volt reference 1 or 2 bus for more than 0.5 second.

Action Taken When the DTC Sets
DTCs P0641 and P0651 are Type A DTCs.

Conditions for Clearing the MIL/DTC
DTCs P0641 and P0651 are Type A DTCs.

Diagnostic Aids
It may be possible to locate the fault by disconnecting one component at a time from the 5-volt reference circuit while viewing the 5-Volt Reference circuit parameter on the scan tool. The scan tool parameter would change from Fault to OK when the source of the fault is disconnected.

If all 5-volt reference components have been disconnected and a Fault is still indicated, the fault may exist in the wiring harness.

Circuit/System Verification
With the ignition ON and the engine OFF, observe the 5-volt Reference 1 and 2 parameters. The scan tool should display 4.3-4.7 volts for a normally operating system.

Circuit/System Testing
Important: Additional DTCs will set when disconnecting the components.

1. Ignition OFF, disconnect the harness connector of all appropriate sensors for the applicable DTC.

Important: A short to voltage on the signal circuit of certain components may cause this DTC to set.

2. Ignition ON, measure for 4.8-5.2 volts between one of the 5-volt reference circuits and ground.

* If the voltage is less than the specified value, test for a short to ground on all the 5-volt reference circuits. If all circuits test normal, replace the control module.
* If the voltage is greater than the specified value, test for a short to voltage on all the 5-volt reference circuits, or the signal circuit, for each component associated with the appropriate 5-volt reference circuit. If all circuits test normal, replace the control module.

3. Connect each component associated with the 5-volt reference circuit, one at a time, while monitoring the voltage. The voltage should not change more than 1 volt.

* If the voltage display changes more than the specified value when a component is connected, replace the component.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

Jul 12, 2012 | Chevrolet Colorado Cars & Trucks

1 Answer

I have a 2003 chevy silverado 1500 series and it is showing a trouble code of p0651 and i have no idea what it means can you tell me and help fix it?

Possible causes:
- Shorted sensor
- Shorted sensor circuit
- Failed ECM

Unfortunatly error codes are very sparse when it comes to giving specifics. The only recommendation is to take it to a certified chevrolet mechanic. I know that isn't the advice you wanted to hear, but its the best I personally can do.

Hopefully one of our mechanics will see this post and be able to give you some better advice.

May 30, 2011 | Computers & Internet

1 Answer

Having trouble geting it inspected reading code po651

P0651 indicate a problem with the fuel tank pressure system. Insure the cap is tight ... Might want to inspect the gas cap for bad / worm o-ring or seals.. replacement would be recomended

Nov 26, 2010 | Chevrolet S 10 Cars & Trucks

1 Answer

Require an unlock code for a 1999 GMC Jimmy

Try the owner center of GMC for information on the unlock code for the 1999 GMC Jimmy.

Aug 26, 2010 | 1999 GMC Jimmy

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