Question about 1999 Chevrolet K1500

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Showing ic circuit high voltage on 1999 1500 5.7 yukon

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Could be a wiring problem, short, ignition switch trouble or PCM related. I would see a dealer as most private shops won't have access to the diagnostic procedures to help

Posted on Sep 30, 2009


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2006 GMC Yukon, 3/4 ton with tow package will not idle above 1200 rpms/10-15 mph

check ICS for correct operation
engine idle speed is 850 -950 rpms for auto and 750-850 for manual
at 1200 rpms you are not on the idle circuits but on power circuits
run the fault codes

Jan 15, 2017 | 2006 GMC Yukon

1 Answer

I have a 2007 yukon denali xl, I got my front brakes and right wheel hub changed. When he got doney brake lights in the back of the truck wI'll not shut off. Brake light switch did nothing to help..

Who put the front brakes an wheel hub bearing on the vehicle ? A qualified repair shop ? A friend ? The front brakes an wheel hub would have nothing to do with the brake lights . An the brake light switch is an input to the BCM - body control module .
Stop Lamps
When the driver presses the brake pedal, the switch contacts open and battery positive voltage is interrupted to the BCM. The BCM then supplies voltage to both the turn/stop lamp supply voltage circuit and trailer rear turn/stop lamp supply voltage circuits. The BCM also supplies voltage to the CHMSL though a dedicated circuit.
I suggest you take it back to who did the front brakes , or a quailfied repair shop .
DTC B3445 00: Stop Lamp Circuit - DO you know what a DTC is ? diagnostic trouble code !
Diagnostic Fault Information
Short to Ground
Open/High Resistance
Short to Voltage
Signal Performance
Stop Lamp Supply Voltage
B3445 00
Stop Lamps Inoperative
Stop Lamps Always On
Circuit/System Testing
Disconnect the stop lamps and test the individual stop lamp assemblies for internal shorts between all terminals.
? If a short between terminals is found, replace the stop lamp socket or circuit board as applicable.
Test the stop lamp supply voltage circuit for a short to ground.
? If all circuits/connections test normal, replace the BCM.

Nov 09, 2016 | 2007 GMC Yukon XL Denali

1 Answer

Codes p0203, p0123, and p0113 are showing for my 2001 jeep grand cherokee. The voltage from the tps plug was 1.5v

P0113 intake air temp voltage too high
P0123 Throttle position sensor voltage too high
P0203 is injector #3 control circuit
voltage is higher that 4.9 volts short to 5 volt supply circuit

erase the codes and drive vehicle to see if the codes come back if they do you have a hard code check the supply circuit for a short

Nov 11, 2013 | 2001 Jeep Grand Cherokee

1 Answer

Started with Oil Pressure dropping

DTC P0521: Engine Oil Pressure (EOP) Sensor Performance

The engine oil pressure (EOP) sensor changes voltage based on the engine oil pressure. The EOP sensor is a 3-wire sensor comprising of the signal circuit, the low reference circuit and the 5-volt reference circuit. The engine control module (ECM) supplies 5 volts to the EOP sensor via the 5-volt reference circuit and provides ground via the EOP low reference circuit. The ECM monitors the signal circuit of the EOP sensor to determine the EOP sensor voltage is within the normal operating range of approximately 1-4 volts. When the engine oil pressure is high, the EOP sensor voltage is high and the ECM senses a high signal voltage. When the engine oil pressure is low, the EOP sensor voltage is low and the ECM senses a low signal voltage. The ECM sends the EOP information to the instrument panel cluster (IPC) via GMLAN serial data message.

Conditions for Setting the DTC
The ECM detects that the difference between the predicted oil pressure and the actual oil pressure is either less than 47 kPa (6.8 psi) or greater than 50 kPa (7.3 psi).

Your best bet ,take it to a qualified repair shop that has the proper diagnostic testing equipment to diagnose this.

Nov 05, 2017 | 2008 GMC Yukon Xl 4WD

1 Answer

Code that came up on the OBD is P0463 Fuel level sensor A circuit high input what does that mean and how can it be fix?

DTC P0463 - Fuel gauge sender unit circuit high input
• The PCM monitors the fuel tank level and input voltage from the fuel gauge sender unit when the engine is running. If the input voltage is more than 2.5 V and fuel tank level is empty, the PCM determines that the fuel gauge sender unit circuit input voltage is high.

Diagnostic support note
• This is a continuous monitor (CCM).
• The MIL illuminates if the PCM detects the above malfunction condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM.
• PENDING CODE is available if the PCM detects the above malfunction condition during the first drive cycle.
• FREEZE FRAME DATA is available.
• The DTC is stored in the PCM memory.

Possible cause:
• Fuel gauge sender unit malfunction
• Instrument cluster malfunction
• PCM malfunction

Feel free to contact us if need additional details. Good luck.

Sep 08, 2011 | 2001 GMC Yukon

1 Answer

I have a 2002 yukon xlt, today the battery light started coming on intermitantly and the battery started losing voltage, I pulled the alternator and had it tested at 2 different auto parts stores , both...

Is there B+ voltage on the heavy gage wire on the back of the alternator ? Possible blown fusible link. Plus the two wires in the connector go to the PCM - engine computer . One is the turn on signal ,the other is charge indicator control . Having the vehicle checked for DTC'S - diagnostic trouble codes should also be done .DTC P1637
The powertrain control module (PCM) uses the generator turn on signal circuit to control the generator. A high side driver within the PCM allows the PCM to turn the generator ON and OFF. When Generator operation is desired, the PCM sends a 10 volt signal to the voltage regulator via the generator turn on signal circuit. This causes the voltage regulator to begin controlling the generator field circuit. Once the Generator is enabled by the PCM, the voltage regulator controls generator output independently of the PCM. Under certain operating conditions, the PCM can turn Off the generator by turning Off the 10 volt signal on the generator turn on signal circuit. The PCM has fault detection circuitry which monitors the state of the generator turn on signal circuit. If the fault detection circuit senses a voltage other than what is expected, this DTC will set. The voltage regulator also contains fault detection circuitry. If the regulator detects a problem, the regulator will ground the generator turn on signal circuit, pulling the voltage low. This also causes the PCM to set the DTC.
Your best bet mite be to take it to a qualified repair shop.

Dec 28, 2017 | 2002 GMC Yukon XL

1 Answer

2001 pontiac bonneville codes 1351 and 1371

1351--IC circuit high voltage (ignition coil control circuit)

1371--DI low resolution circuit/Too few ignition reference pulses

Apr 03, 2010 | 2001 Pontiac Bonneville

1 Answer

Question on electrical jargon for ford sport trac 2001


High resistance in a wire run... is caused by rust and loose fittings. Open circuit is a broken wire or broken connector.

Nov 23, 2009 | 2001 Ford Explorer Sport Trac

2 Answers

1994 Yukon running rich and flooding

Fuel pump circuit (low voltage)
Try replacing the fuel pump relay or testing it if you have the manual.

Sep 20, 2009 | 1994 GMC Yukon

1 Answer

Dtc code P1351 on a 1997 yukon

1351 Ignition control circuit voltage high
Ignition control circuit open
Good luck countrycurt0

Sep 09, 2008 | GMC Yukon Cars & Trucks

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