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Medium Duty Trucks Discuss GM Kodiak/Topkicks, 4500/5500 & up medium duty engine & all associated components.

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Old 10-03-2019, 10:56 AM   #1 (permalink)
NDFARMER95
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4500 electrical issues

Have a 06 4500 4wd that I'm having some electrical issues with. The speedometer will read speed up to 40 and then crash out and it also won't switch into 4wd. There's no orange indicator light when all this is going on. I read vss while driving down the road on the autocal and everything appears to be working. When the orange indicator light lights up, the speedometer works. Has thrown a p0502 code in the past, but nothing currently. Anybody else had these issues?

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Last edited by OkDually; 10-03-2019 at 11:19 AM. Reason: prefix adj
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Old 10-04-2019, 05:56 AM   #2 (permalink)
ronjhall
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Bad grounds. Start by checking where the main grounds start on passenger frame rail.

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Old 10-04-2019, 12:24 PM   #3 (permalink)
Ron Nielson
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You can get wiring diagrams for your vehicle at GMUPFITTER.COM. And here is information about P0502. Kinda sounds like you have similar problems, now, but no code P0502

DTC P0502 or P0503

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic approach.
Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor
DTC P0502

Vehicle Speed Sensor (VSS) Circuit Low Voltage

DTC P0503

Vehicle Speed Sensor (VSS) Circuit Intermittent

Diagnostic Fault Information



Circuit/System Description

The vehicle speed information is provided to the engine control module (ECM) by the vehicle speed sensor (VSS). The VSS is a permanent magnet generator that is mounted to the transmission and produces a pulsing voltage. The AC voltage amplitude and frequency increases with vehicle speed. The ECM converts the pulsing voltage into km/h (mph). The ECM supplies the VSS signal to the following components:

The instrument panel for speedometer and odometer operation
The cruise control module

Conditions for Running the DTC

P0502

DTC P0120, P0220 or P0503 are not set.
The TP sensor angle is more than 3.5 percent.
The engine is running.
The system voltage is 8-18V.
TFT is more than -40C (-40F)
The engine speed is 1,500-6,500 RPM.
Vehicle speed is less than 200 km/h (124 mph).
Engine torque is 68-8192 N.m (50-6,042 lb ft).
The PTO is not active.

P0503

The system voltage is 8-18V.
The engine speed is 500-7,500 RPM.
Transmission out speed change is less than 146 RPM for 2 seconds.
The PTO is not active.
The OSS is at least 292 RPM for 2 seconds.
The OSS has not changed more than 146 RPM for 2 seconds.
The 4WD range has not changed within 6 seconds.

Conditions for Setting the DTC

P0502

The transmission output speed is 58 RPM or less for 5 seconds.

P0503

The transmission output speed drops 351 RPMs in less than 3 seconds.

Action Taken When the DTC Sets

P0502 and P0503 are Type B DTCs.

Conditions for Clearing the DTC

P0502 and P0503 are Type B DTCs.

Reference Information
Schematic Reference

Connector End View Reference
See: Diagrams\Connector Views

Component Connector End Views
Description and Operation

Manual Transmission Description and Operation (See: Transmission and Drivetrain\Manual Transmission/Transaxle\Description and Operation\Tremec 5-Speed (TZ0) - Manual Transmission)
Electrical Information Reference

Circuit Testing
Connector Repairs
Testing for Intermittent Conditions and Poor Connections
Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference

Control Module References
Special Tools

J 35616 GM-Approved Terminal Test Kit

Circuit/System Verification

Raise and support the drive wheels.
Start and idle the engine.
Place the transmission in second gear and release the clutch pedal.
Monitor VSS parameter on the scan tool. The VSS parameter should increase as the drive wheel speed increases.
Operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that are captured in the Freeze Frame/Failure Records List.

Circuit/System Testing

Disconnect the ECM harness connector X1.
Measure for 1,300-1,500 ohms at 25C (77F) between the VSS high signal circuit terminal 71 and the VSS low signal circuit terminal 72.

If the value is greater than 1,500 ohms test the VSS high signal circuit and the VSS low signal circuit for an open/high resistance. If the circuits/connections test normal, replace the vehicle speed sensor.
If the value is less than 1,300 ohms test the VSS high signal and the VSS low signal circuits for a shorted together condition. If the circuits/connections test normal, replace the vehicle speed sensor.

Measure for more than 10 ohms of resistance between the VSS high signal circuit terminal 71 and ground.

If the value is less than the specified range, repair the short to ground.

Measure for more than 10 ohms of resistance between the VSS low signal circuit terminal 72 and ground.

If the value is less than the specified range, repair the short to ground.

Reconnect the ECM connector. Disconnect the VSS connector.
Ignition ON, test the VSS high signal circuit terminal B for a short to voltage.

If all circuits/connections test normal, test or replace the VSS.
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Old 01-16-2020, 07:56 PM   #4 (permalink)
MississippiJoe
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Quote:
Originally Posted by NDFARMER95 View Post
Have a 06 4500 4wd that I'm having some electrical issues with. The speedometer will read speed up to 40 and then crash out and it also won't switch into 4wd. There's no orange indicator light when all this is going on. I read vss while driving down the road on the autocal and everything appears to be working. When the orange indicator light lights up, the speedometer works. Has thrown a p0502 code in the past, but nothing currently. Anybody else had these issues?

Sent from my SM-G930V using Tapatalk

Were you able to find a solution? My 2006 C5500 is doing the same thing.
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Last edited by OkDually; 01-16-2020 at 08:41 PM. Reason: sig
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Old 01-24-2020, 01:56 AM   #5 (permalink)
SLOWPOKE96Z28
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Does your cruise control work when this is happening?
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