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Home / DTC / P0608 — Control Module VSS Output A

P0608 — Control Module VSS Output A

Detailed page for trouble code P0608.

35,619codes
59brands
11,925generic
23,694specific
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Code

P0608

Generic P — Powertrain

Control Module VSS Output A

Brand: Generic
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

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

  1. 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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P0500 P0502 P0503 P0606 P0607 U0121
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Code

P0608

GWM P — Powertrain

- Sensor fault VSS "A" of the control unit

Brand: GWM
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

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

  1. 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

P0500 P0502 P0503 P0606 P0607 U0121
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Code

P0608

HUMMER P — Powertrain

Control Module VSS Output "A" Malfunction

Brand: HUMMER
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

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

  1. 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

P0500 P0502 P0503 P0606 P0607 U0121
Repair manuals

Manual library for HUMMER

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Browse 138 HUMMER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

HUMMER

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Code

P0608

LAND ROVER P — Powertrain

Vehicle Speed Output

Brand: LAND ROVER
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

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

  1. 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

P0500 P0502 P0503 P0606 P0607 U0121
413

Browse 413 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

LAND ROVER

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+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
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Code

P0608

MERCEDES-BENZ P — Powertrain

Control Module VSS Output "A" Malfunction

Brand: MERCEDES-BENZ
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

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

  1. 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

P0500 P0502 P0503 P0606 P0607 U0121
856

Browse 856 MERCEDES-BENZ manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

MERCEDES-BENZ

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+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
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