Code
P0608
Generic
P — Powertrain
Control Module VSS Output A
Views:
UK: 19
EN: 33
RU: 26
AI status
Completed
Completed
100%
Causes
- Open circuit or short in the VSS output wiring (A channel)
- Poor power or ground to the control module
- Corroded or damaged connector at PCM/ECM
- Internal control module output driver failure
- Intermittent connection caused by chafed wiring or water ingress
- Incorrect or corrupted module software/calibration
Symptoms
- Check Engine Light (MIL) illuminated and P0608 stored
- Speedometer or odometer not working or erratic
- Transmission shifting incorrectly or stuck in limp mode
- Cruise control inoperative
- ABS or traction control warnings if they rely on the PCM VSS output
- Related modules report no vehicle speed or incorrect speed
What to check
- Read and record stored/active DTCs and freeze frame with a scan tool
- Check related network and module communication codes (U‑codes)
- Visually inspect PCM connector and VSS output harness for damage, corrosion or water
- Verify PCM has proper battery power and good ground(s) at the module
- Monitor live data: compare PCM VSS output PID to wheel speed sensors/cluster speed
- Backprobe VSS output circuit and check for expected voltage/waveform with a multimeter or preferably an oscilloscope
Signal parameters
- Type: pulsed square wave / open‑collector or switched output (varies by vehicle)
- Amplitude: typically 0–5V or 0–12V depending on design (vehicle specific)
- Frequency: proportional to vehicle speed (0 Hz at rest, increases with speed)
- Duty cycle: often near 50% but varies by OEM
- Reference: compare measured Hz or V to expected speed (e.g., 1 Hz = X km/h — check vehicle documentation)
Diagnostic algorithm
- Verify the code: connect a capable scan tool, record DTCs, freeze frame and related codes. Clear codes and perform a road test while monitoring VSS outputs. 2) Inspect connectors and wiring: visually inspect PCM connector(s) and harness for damage, corrosion, pin damage or water intrusion. Repair as needed. 3) Check PCM power/ground: verify all supply voltages and grounds at the PCM are within spec. Fix any supply/ground issues. 4) Monitor signals: backprobe the VSS output A pin at the PCM and at the destination (speedometer/cluster or ABS) while cranking and driving. Use an oscilloscope to confirm waveform, amplitude and frequency are correct and correlate to vehicle speed. 5) Isolate circuit: if the PCM output is correct at the module but not at the receiving module, trace and repair wiring/connectors between them. If the output is missing or incorrect at the PCM pin, suspect the PCM output driver. 6) Check for intermittent faults: perform wiggle tests and road test to reproduce intermittent behavior; inspect for wiring chafe against chassis components. 7) Reprogram/replace module only after confirming wiring, power, and grounds are good and other causes are ruled out. Follow manufacturer procedures for module replacement and coding. 8) After repairs, clear codes and verify repair with a full test drive and scan tool data verification.
Likely causes
- Broken or shorted VSS output wire between PCM and speedometer/cluster or downstream module
- Faulty PCM output driver on VSS A channel
- Loose, pushed-out, corroded or bent PCM connector pins
- Blown fuse or poor power/ground to PCM
- Connector contaminated by corrosion or moisture causing intermittent signal
- Recent module replacement or programming error
Fault status
Status
Control Module VSS Output A — PCM VSS output circuit A is out of expected range or missing.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
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Code
P0608
GWM
P — Powertrain
- Sensor fault VSS "A" of the control unit
Views:
UK: 0
EN: 0
RU: 0
AI status
Completed
Completed
100%
Causes
- Open circuit or short in the VSS output wiring (A channel)
- Poor power or ground to the control module
- Corroded or damaged connector at PCM/ECM
- Internal control module output driver failure
- Intermittent connection caused by chafed wiring or water ingress
- Incorrect or corrupted module software/calibration
Symptoms
- Check Engine Light (MIL) illuminated and P0608 stored
- Speedometer or odometer not working or erratic
- Transmission shifting incorrectly or stuck in limp mode
- Cruise control inoperative
- ABS or traction control warnings if they rely on the PCM VSS output
- Related modules report no vehicle speed or incorrect speed
What to check
- Read and record stored/active DTCs and freeze frame with a scan tool
- Check related network and module communication codes (U‑codes)
- Visually inspect PCM connector and VSS output harness for damage, corrosion or water
- Verify PCM has proper battery power and good ground(s) at the module
- Monitor live data: compare PCM VSS output PID to wheel speed sensors/cluster speed
- Backprobe VSS output circuit and check for expected voltage/waveform with a multimeter or preferably an oscilloscope
Signal parameters
- Type: pulsed square wave / open‑collector or switched output (varies by vehicle)
- Amplitude: typically 0–5V or 0–12V depending on design (vehicle specific)
- Frequency: proportional to vehicle speed (0 Hz at rest, increases with speed)
- Duty cycle: often near 50% but varies by OEM
- Reference: compare measured Hz or V to expected speed (e.g., 1 Hz = X km/h — check vehicle documentation)
Diagnostic algorithm
- Verify the code: connect a capable scan tool, record DTCs, freeze frame and related codes. Clear codes and perform a road test while monitoring VSS outputs. 2) Inspect connectors and wiring: visually inspect PCM connector(s) and harness for damage, corrosion, pin damage or water intrusion. Repair as needed. 3) Check PCM power/ground: verify all supply voltages and grounds at the PCM are within spec. Fix any supply/ground issues. 4) Monitor signals: backprobe the VSS output A pin at the PCM and at the destination (speedometer/cluster or ABS) while cranking and driving. Use an oscilloscope to confirm waveform, amplitude and frequency are correct and correlate to vehicle speed. 5) Isolate circuit: if the PCM output is correct at the module but not at the receiving module, trace and repair wiring/connectors between them. If the output is missing or incorrect at the PCM pin, suspect the PCM output driver. 6) Check for intermittent faults: perform wiggle tests and road test to reproduce intermittent behavior; inspect for wiring chafe against chassis components. 7) Reprogram/replace module only after confirming wiring, power, and grounds are good and other causes are ruled out. Follow manufacturer procedures for module replacement and coding. 8) After repairs, clear codes and verify repair with a full test drive and scan tool data verification.
Likely causes
- Broken or shorted VSS output wire between PCM and speedometer/cluster or downstream module
- Faulty PCM output driver on VSS A channel
- Loose, pushed-out, corroded or bent PCM connector pins
- Blown fuse or poor power/ground to PCM
- Connector contaminated by corrosion or moisture causing intermittent signal
- Recent module replacement or programming error
Fault status
Status
Control Module VSS Output A — PCM VSS output circuit A is out of expected range or missing.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
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Code
P0608
HUMMER
P — Powertrain
Control Module VSS Output "A" Malfunction
Views:
UK: 11
EN: 15
RU: 14
AI status
Completed
Completed
100%
Causes
- Open circuit or short in the VSS output wiring (A channel)
- Poor power or ground to the control module
- Corroded or damaged connector at PCM/ECM
- Internal control module output driver failure
- Intermittent connection caused by chafed wiring or water ingress
- Incorrect or corrupted module software/calibration
Symptoms
- Check Engine Light (MIL) illuminated and P0608 stored
- Speedometer or odometer not working or erratic
- Transmission shifting incorrectly or stuck in limp mode
- Cruise control inoperative
- ABS or traction control warnings if they rely on the PCM VSS output
- Related modules report no vehicle speed or incorrect speed
What to check
- Read and record stored/active DTCs and freeze frame with a scan tool
- Check related network and module communication codes (U‑codes)
- Visually inspect PCM connector and VSS output harness for damage, corrosion or water
- Verify PCM has proper battery power and good ground(s) at the module
- Monitor live data: compare PCM VSS output PID to wheel speed sensors/cluster speed
- Backprobe VSS output circuit and check for expected voltage/waveform with a multimeter or preferably an oscilloscope
Signal parameters
- Type: pulsed square wave / open‑collector or switched output (varies by vehicle)
- Amplitude: typically 0–5V or 0–12V depending on design (vehicle specific)
- Frequency: proportional to vehicle speed (0 Hz at rest, increases with speed)
- Duty cycle: often near 50% but varies by OEM
- Reference: compare measured Hz or V to expected speed (e.g., 1 Hz = X km/h — check vehicle documentation)
Diagnostic algorithm
- Verify the code: connect a capable scan tool, record DTCs, freeze frame and related codes. Clear codes and perform a road test while monitoring VSS outputs. 2) Inspect connectors and wiring: visually inspect PCM connector(s) and harness for damage, corrosion, pin damage or water intrusion. Repair as needed. 3) Check PCM power/ground: verify all supply voltages and grounds at the PCM are within spec. Fix any supply/ground issues. 4) Monitor signals: backprobe the VSS output A pin at the PCM and at the destination (speedometer/cluster or ABS) while cranking and driving. Use an oscilloscope to confirm waveform, amplitude and frequency are correct and correlate to vehicle speed. 5) Isolate circuit: if the PCM output is correct at the module but not at the receiving module, trace and repair wiring/connectors between them. If the output is missing or incorrect at the PCM pin, suspect the PCM output driver. 6) Check for intermittent faults: perform wiggle tests and road test to reproduce intermittent behavior; inspect for wiring chafe against chassis components. 7) Reprogram/replace module only after confirming wiring, power, and grounds are good and other causes are ruled out. Follow manufacturer procedures for module replacement and coding. 8) After repairs, clear codes and verify repair with a full test drive and scan tool data verification.
Likely causes
- Broken or shorted VSS output wire between PCM and speedometer/cluster or downstream module
- Faulty PCM output driver on VSS A channel
- Loose, pushed-out, corroded or bent PCM connector pins
- Blown fuse or poor power/ground to PCM
- Connector contaminated by corrosion or moisture causing intermittent signal
- Recent module replacement or programming error
Fault status
Status
Control Module VSS Output A — PCM VSS output circuit A is out of expected range or missing.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
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0
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Code
P0608
LAND ROVER
P — Powertrain
Vehicle Speed Output
Views:
UK: 4
EN: 8
RU: 7
AI status
Completed
Completed
100%
Causes
- Open circuit or short in the VSS output wiring (A channel)
- Poor power or ground to the control module
- Corroded or damaged connector at PCM/ECM
- Internal control module output driver failure
- Intermittent connection caused by chafed wiring or water ingress
- Incorrect or corrupted module software/calibration
Symptoms
- Check Engine Light (MIL) illuminated and P0608 stored
- Speedometer or odometer not working or erratic
- Transmission shifting incorrectly or stuck in limp mode
- Cruise control inoperative
- ABS or traction control warnings if they rely on the PCM VSS output
- Related modules report no vehicle speed or incorrect speed
What to check
- Read and record stored/active DTCs and freeze frame with a scan tool
- Check related network and module communication codes (U‑codes)
- Visually inspect PCM connector and VSS output harness for damage, corrosion or water
- Verify PCM has proper battery power and good ground(s) at the module
- Monitor live data: compare PCM VSS output PID to wheel speed sensors/cluster speed
- Backprobe VSS output circuit and check for expected voltage/waveform with a multimeter or preferably an oscilloscope
Signal parameters
- Type: pulsed square wave / open‑collector or switched output (varies by vehicle)
- Amplitude: typically 0–5V or 0–12V depending on design (vehicle specific)
- Frequency: proportional to vehicle speed (0 Hz at rest, increases with speed)
- Duty cycle: often near 50% but varies by OEM
- Reference: compare measured Hz or V to expected speed (e.g., 1 Hz = X km/h — check vehicle documentation)
Diagnostic algorithm
- Verify the code: connect a capable scan tool, record DTCs, freeze frame and related codes. Clear codes and perform a road test while monitoring VSS outputs. 2) Inspect connectors and wiring: visually inspect PCM connector(s) and harness for damage, corrosion, pin damage or water intrusion. Repair as needed. 3) Check PCM power/ground: verify all supply voltages and grounds at the PCM are within spec. Fix any supply/ground issues. 4) Monitor signals: backprobe the VSS output A pin at the PCM and at the destination (speedometer/cluster or ABS) while cranking and driving. Use an oscilloscope to confirm waveform, amplitude and frequency are correct and correlate to vehicle speed. 5) Isolate circuit: if the PCM output is correct at the module but not at the receiving module, trace and repair wiring/connectors between them. If the output is missing or incorrect at the PCM pin, suspect the PCM output driver. 6) Check for intermittent faults: perform wiggle tests and road test to reproduce intermittent behavior; inspect for wiring chafe against chassis components. 7) Reprogram/replace module only after confirming wiring, power, and grounds are good and other causes are ruled out. Follow manufacturer procedures for module replacement and coding. 8) After repairs, clear codes and verify repair with a full test drive and scan tool data verification.
Likely causes
- Broken or shorted VSS output wire between PCM and speedometer/cluster or downstream module
- Faulty PCM output driver on VSS A channel
- Loose, pushed-out, corroded or bent PCM connector pins
- Blown fuse or poor power/ground to PCM
- Connector contaminated by corrosion or moisture causing intermittent signal
- Recent module replacement or programming error
Fault status
Status
Control Module VSS Output A — PCM VSS output circuit A is out of expected range or missing.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
Similar codes
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
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Send to email
Code
P0608
MERCEDES-BENZ
P — Powertrain
Control Module VSS Output "A" Malfunction
Views:
UK: 11
EN: 17
RU: 16
AI status
Completed
Completed
100%
Causes
- Open circuit or short in the VSS output wiring (A channel)
- Poor power or ground to the control module
- Corroded or damaged connector at PCM/ECM
- Internal control module output driver failure
- Intermittent connection caused by chafed wiring or water ingress
- Incorrect or corrupted module software/calibration
Symptoms
- Check Engine Light (MIL) illuminated and P0608 stored
- Speedometer or odometer not working or erratic
- Transmission shifting incorrectly or stuck in limp mode
- Cruise control inoperative
- ABS or traction control warnings if they rely on the PCM VSS output
- Related modules report no vehicle speed or incorrect speed
What to check
- Read and record stored/active DTCs and freeze frame with a scan tool
- Check related network and module communication codes (U‑codes)
- Visually inspect PCM connector and VSS output harness for damage, corrosion or water
- Verify PCM has proper battery power and good ground(s) at the module
- Monitor live data: compare PCM VSS output PID to wheel speed sensors/cluster speed
- Backprobe VSS output circuit and check for expected voltage/waveform with a multimeter or preferably an oscilloscope
Signal parameters
- Type: pulsed square wave / open‑collector or switched output (varies by vehicle)
- Amplitude: typically 0–5V or 0–12V depending on design (vehicle specific)
- Frequency: proportional to vehicle speed (0 Hz at rest, increases with speed)
- Duty cycle: often near 50% but varies by OEM
- Reference: compare measured Hz or V to expected speed (e.g., 1 Hz = X km/h — check vehicle documentation)
Diagnostic algorithm
- Verify the code: connect a capable scan tool, record DTCs, freeze frame and related codes. Clear codes and perform a road test while monitoring VSS outputs. 2) Inspect connectors and wiring: visually inspect PCM connector(s) and harness for damage, corrosion, pin damage or water intrusion. Repair as needed. 3) Check PCM power/ground: verify all supply voltages and grounds at the PCM are within spec. Fix any supply/ground issues. 4) Monitor signals: backprobe the VSS output A pin at the PCM and at the destination (speedometer/cluster or ABS) while cranking and driving. Use an oscilloscope to confirm waveform, amplitude and frequency are correct and correlate to vehicle speed. 5) Isolate circuit: if the PCM output is correct at the module but not at the receiving module, trace and repair wiring/connectors between them. If the output is missing or incorrect at the PCM pin, suspect the PCM output driver. 6) Check for intermittent faults: perform wiggle tests and road test to reproduce intermittent behavior; inspect for wiring chafe against chassis components. 7) Reprogram/replace module only after confirming wiring, power, and grounds are good and other causes are ruled out. Follow manufacturer procedures for module replacement and coding. 8) After repairs, clear codes and verify repair with a full test drive and scan tool data verification.
Likely causes
- Broken or shorted VSS output wire between PCM and speedometer/cluster or downstream module
- Faulty PCM output driver on VSS A channel
- Loose, pushed-out, corroded or bent PCM connector pins
- Blown fuse or poor power/ground to PCM
- Connector contaminated by corrosion or moisture causing intermittent signal
- Recent module replacement or programming error
Fault status
Status
Control Module VSS Output A — PCM VSS output circuit A is out of expected range or missing.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
Similar codes
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
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0
Send to email