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Home / DTC / P0751 — Shift Solenoid A Performance/Stuck Off

P0751 — Shift Solenoid A Performance/Stuck Off

Detailed page for trouble code P0751.

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22,491specific
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Code

P0751

Generic P — Powertrain

Shift Solenoid A Performance/Stuck Off

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

Causes

  • Open or shorted wiring between PCM and shift solenoid A
  • Failed shift solenoid A (coil open or internal short)
  • Stuck valve or contamination in valve body (hydraulic blockage)
  • Low/contaminated automatic transmission fluid (ATF)
  • Poor ground at transmission or PCM
  • Faulty PCM/TCM (less common)

Symptoms

  • Check engine/shift light illuminated
  • Harsh, delayed, or missing shifts
  • Transmission stuck in one gear or limp/limitation mode
  • Erratic or harsh downshifts
  • No engagement into certain gears or slipping
  • Poor drivability under load

What to check

  • Scan for stored codes and freeze-frame data; record related transmission codes
  • Check automatic transmission fluid level and condition (color, smell, contamination)
  • Visually inspect transmission harness and connector for damage, corrosion, bent pins, or water intrusion
  • Perform active test or command shift solenoid A with a scan tool and observe response
  • Back-probe solenoid connector while commanding to measure voltage/duty and ground
  • Measure solenoid coil resistance with an ohmmeter (compare to spec)

Signal parameters

  • Solenoid coil resistance: check manufacturer spec (typical range ~5–30 Ω; values vary by design)
  • Voltage at solenoid connector: ~battery voltage (11–14 V) when PCM supplies power, or pulsed ground/duty cycle signal depending on circuit type
  • Command signal: PCM may use a switched 12V or switched ground or PWM duty-cycle control (0–100% duty)
  • Current draw: typical solenoid currents commonly range 0.2–2 A (vehicle-specific)
  • Activation response: mechanical valve should move promptly when energized; delayed or no movement indicates hydraulic/mechanical or electrical failure

Diagnostic algorithm

  1. Retrieve all transmission-related and engine codes, note freeze-frame and conditions. Clear codes and attempt to re-run to confirm repeatability.
  2. Check ATF level and condition; correct level and, if heavily contaminated, consider fluid/ filter service before further electrical diagnostics.
  3. Inspect the solenoid harness connector and wiring for damage, corrosion, bent pins, or moisture. Repair as needed.
  4. With a scan tool, command (activate) shift solenoid A and observe scanner feedback and transmission behavior. If the tool can show actual commanded vs. reported status, record results.
  5. Back-probe the solenoid connector while commanding: verify expected voltage or pulsed ground signal at the correct times. If no command present, suspect PCM or wiring upstream.
  6. With ignition OFF, measure solenoid coil resistance at the connector; compare to specification. Infinite/open or short to ground/voltage indicates solenoid or internal short.
  7. Check continuity between solenoid connector and PCM pin; check for shorts to ground or battery. Repair any wiring faults.
  8. If electrical tests are good but solenoid does not operate or shifts remain abnormal, remove valve body or solenoid assembly to inspect for debris, stuck valve, or hydraulic faults. Clean or replace valve body/solenoid as required.
  9. After repair or replacement, clear codes, perform relearn/procedure if manufacturer specifies, and road-test to verify proper shift operation and that code does not return.
  10. If wiring, solenoid, and valve body are good, consider PCM/TCM fault diagnosis (typically last resort) with specialist tools.

Likely causes

  • Broken or corroded connector pins at the solenoid harness
  • Shift solenoid A coil resistance out of specification (open circuit)
  • Short to ground in the solenoid control circuit
  • Solenoid valve stuck closed/open due to debris or varnish in valve body
  • Low ATF level or degraded fluid causing sluggish solenoid movement

Fault status

⚠️ Status
P0751 - Shift Solenoid A Performance/Stuck Off: solenoid failed to respond correctly to PCM command (electrical or hydraulic fault).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

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Code

P0751

GWM P — Powertrain

- The solenoid switch A is not adjusted correctly.

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

Causes

  • Open or shorted wiring between PCM and shift solenoid A
  • Failed shift solenoid A (coil open or internal short)
  • Stuck valve or contamination in valve body (hydraulic blockage)
  • Low/contaminated automatic transmission fluid (ATF)
  • Poor ground at transmission or PCM
  • Faulty PCM/TCM (less common)

Symptoms

  • Check engine/shift light illuminated
  • Harsh, delayed, or missing shifts
  • Transmission stuck in one gear or limp/limitation mode
  • Erratic or harsh downshifts
  • No engagement into certain gears or slipping
  • Poor drivability under load

What to check

  • Scan for stored codes and freeze-frame data; record related transmission codes
  • Check automatic transmission fluid level and condition (color, smell, contamination)
  • Visually inspect transmission harness and connector for damage, corrosion, bent pins, or water intrusion
  • Perform active test or command shift solenoid A with a scan tool and observe response
  • Back-probe solenoid connector while commanding to measure voltage/duty and ground
  • Measure solenoid coil resistance with an ohmmeter (compare to spec)

Signal parameters

  • Solenoid coil resistance: check manufacturer spec (typical range ~5–30 Ω; values vary by design)
  • Voltage at solenoid connector: ~battery voltage (11–14 V) when PCM supplies power, or pulsed ground/duty cycle signal depending on circuit type
  • Command signal: PCM may use a switched 12V or switched ground or PWM duty-cycle control (0–100% duty)
  • Current draw: typical solenoid currents commonly range 0.2–2 A (vehicle-specific)
  • Activation response: mechanical valve should move promptly when energized; delayed or no movement indicates hydraulic/mechanical or electrical failure

Diagnostic algorithm

  1. Retrieve all transmission-related and engine codes, note freeze-frame and conditions. Clear codes and attempt to re-run to confirm repeatability.
  2. Check ATF level and condition; correct level and, if heavily contaminated, consider fluid/ filter service before further electrical diagnostics.
  3. Inspect the solenoid harness connector and wiring for damage, corrosion, bent pins, or moisture. Repair as needed.
  4. With a scan tool, command (activate) shift solenoid A and observe scanner feedback and transmission behavior. If the tool can show actual commanded vs. reported status, record results.
  5. Back-probe the solenoid connector while commanding: verify expected voltage or pulsed ground signal at the correct times. If no command present, suspect PCM or wiring upstream.
  6. With ignition OFF, measure solenoid coil resistance at the connector; compare to specification. Infinite/open or short to ground/voltage indicates solenoid or internal short.
  7. Check continuity between solenoid connector and PCM pin; check for shorts to ground or battery. Repair any wiring faults.
  8. If electrical tests are good but solenoid does not operate or shifts remain abnormal, remove valve body or solenoid assembly to inspect for debris, stuck valve, or hydraulic faults. Clean or replace valve body/solenoid as required.
  9. After repair or replacement, clear codes, perform relearn/procedure if manufacturer specifies, and road-test to verify proper shift operation and that code does not return.
  10. If wiring, solenoid, and valve body are good, consider PCM/TCM fault diagnosis (typically last resort) with specialist tools.

Likely causes

  • Broken or corroded connector pins at the solenoid harness
  • Shift solenoid A coil resistance out of specification (open circuit)
  • Short to ground in the solenoid control circuit
  • Solenoid valve stuck closed/open due to debris or varnish in valve body
  • Low ATF level or degraded fluid causing sluggish solenoid movement

Fault status

⚠️ Status
P0751 - Shift Solenoid A Performance/Stuck Off: solenoid failed to respond correctly to PCM command (electrical or hydraulic fault).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P0750 P0752 P0700 P0730 P0760
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Code

P0751

HUMMER P — Powertrain

1-2 Shift Solenoid Valve Performance - No First or Fourth Gear

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

Causes

  • Open or shorted wiring between PCM and shift solenoid A
  • Failed shift solenoid A (coil open or internal short)
  • Stuck valve or contamination in valve body (hydraulic blockage)
  • Low/contaminated automatic transmission fluid (ATF)
  • Poor ground at transmission or PCM
  • Faulty PCM/TCM (less common)

Symptoms

  • Check engine/shift light illuminated
  • Harsh, delayed, or missing shifts
  • Transmission stuck in one gear or limp/limitation mode
  • Erratic or harsh downshifts
  • No engagement into certain gears or slipping
  • Poor drivability under load

What to check

  • Scan for stored codes and freeze-frame data; record related transmission codes
  • Check automatic transmission fluid level and condition (color, smell, contamination)
  • Visually inspect transmission harness and connector for damage, corrosion, bent pins, or water intrusion
  • Perform active test or command shift solenoid A with a scan tool and observe response
  • Back-probe solenoid connector while commanding to measure voltage/duty and ground
  • Measure solenoid coil resistance with an ohmmeter (compare to spec)

Signal parameters

  • Solenoid coil resistance: check manufacturer spec (typical range ~5–30 Ω; values vary by design)
  • Voltage at solenoid connector: ~battery voltage (11–14 V) when PCM supplies power, or pulsed ground/duty cycle signal depending on circuit type
  • Command signal: PCM may use a switched 12V or switched ground or PWM duty-cycle control (0–100% duty)
  • Current draw: typical solenoid currents commonly range 0.2–2 A (vehicle-specific)
  • Activation response: mechanical valve should move promptly when energized; delayed or no movement indicates hydraulic/mechanical or electrical failure

Diagnostic algorithm

  1. Retrieve all transmission-related and engine codes, note freeze-frame and conditions. Clear codes and attempt to re-run to confirm repeatability.
  2. Check ATF level and condition; correct level and, if heavily contaminated, consider fluid/ filter service before further electrical diagnostics.
  3. Inspect the solenoid harness connector and wiring for damage, corrosion, bent pins, or moisture. Repair as needed.
  4. With a scan tool, command (activate) shift solenoid A and observe scanner feedback and transmission behavior. If the tool can show actual commanded vs. reported status, record results.
  5. Back-probe the solenoid connector while commanding: verify expected voltage or pulsed ground signal at the correct times. If no command present, suspect PCM or wiring upstream.
  6. With ignition OFF, measure solenoid coil resistance at the connector; compare to specification. Infinite/open or short to ground/voltage indicates solenoid or internal short.
  7. Check continuity between solenoid connector and PCM pin; check for shorts to ground or battery. Repair any wiring faults.
  8. If electrical tests are good but solenoid does not operate or shifts remain abnormal, remove valve body or solenoid assembly to inspect for debris, stuck valve, or hydraulic faults. Clean or replace valve body/solenoid as required.
  9. After repair or replacement, clear codes, perform relearn/procedure if manufacturer specifies, and road-test to verify proper shift operation and that code does not return.
  10. If wiring, solenoid, and valve body are good, consider PCM/TCM fault diagnosis (typically last resort) with specialist tools.

Likely causes

  • Broken or corroded connector pins at the solenoid harness
  • Shift solenoid A coil resistance out of specification (open circuit)
  • Short to ground in the solenoid control circuit
  • Solenoid valve stuck closed/open due to debris or varnish in valve body
  • Low ATF level or degraded fluid causing sluggish solenoid movement

Fault status

⚠️ Status
P0751 - Shift Solenoid A Performance/Stuck Off: solenoid failed to respond correctly to PCM command (electrical or hydraulic fault).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P0750 P0752 P0700 P0730 P0760
Repair manuals

Manual library for HUMMER

138

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

P0751

LAND ROVER P — Powertrain

Solenoid of marches A performance

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

Causes

  • Open or shorted wiring between PCM and shift solenoid A
  • Failed shift solenoid A (coil open or internal short)
  • Stuck valve or contamination in valve body (hydraulic blockage)
  • Low/contaminated automatic transmission fluid (ATF)
  • Poor ground at transmission or PCM
  • Faulty PCM/TCM (less common)

Symptoms

  • Check engine/shift light illuminated
  • Harsh, delayed, or missing shifts
  • Transmission stuck in one gear or limp/limitation mode
  • Erratic or harsh downshifts
  • No engagement into certain gears or slipping
  • Poor drivability under load

What to check

  • Scan for stored codes and freeze-frame data; record related transmission codes
  • Check automatic transmission fluid level and condition (color, smell, contamination)
  • Visually inspect transmission harness and connector for damage, corrosion, bent pins, or water intrusion
  • Perform active test or command shift solenoid A with a scan tool and observe response
  • Back-probe solenoid connector while commanding to measure voltage/duty and ground
  • Measure solenoid coil resistance with an ohmmeter (compare to spec)

Signal parameters

  • Solenoid coil resistance: check manufacturer spec (typical range ~5–30 Ω; values vary by design)
  • Voltage at solenoid connector: ~battery voltage (11–14 V) when PCM supplies power, or pulsed ground/duty cycle signal depending on circuit type
  • Command signal: PCM may use a switched 12V or switched ground or PWM duty-cycle control (0–100% duty)
  • Current draw: typical solenoid currents commonly range 0.2–2 A (vehicle-specific)
  • Activation response: mechanical valve should move promptly when energized; delayed or no movement indicates hydraulic/mechanical or electrical failure

Diagnostic algorithm

  1. Retrieve all transmission-related and engine codes, note freeze-frame and conditions. Clear codes and attempt to re-run to confirm repeatability.
  2. Check ATF level and condition; correct level and, if heavily contaminated, consider fluid/ filter service before further electrical diagnostics.
  3. Inspect the solenoid harness connector and wiring for damage, corrosion, bent pins, or moisture. Repair as needed.
  4. With a scan tool, command (activate) shift solenoid A and observe scanner feedback and transmission behavior. If the tool can show actual commanded vs. reported status, record results.
  5. Back-probe the solenoid connector while commanding: verify expected voltage or pulsed ground signal at the correct times. If no command present, suspect PCM or wiring upstream.
  6. With ignition OFF, measure solenoid coil resistance at the connector; compare to specification. Infinite/open or short to ground/voltage indicates solenoid or internal short.
  7. Check continuity between solenoid connector and PCM pin; check for shorts to ground or battery. Repair any wiring faults.
  8. If electrical tests are good but solenoid does not operate or shifts remain abnormal, remove valve body or solenoid assembly to inspect for debris, stuck valve, or hydraulic faults. Clean or replace valve body/solenoid as required.
  9. After repair or replacement, clear codes, perform relearn/procedure if manufacturer specifies, and road-test to verify proper shift operation and that code does not return.
  10. If wiring, solenoid, and valve body are good, consider PCM/TCM fault diagnosis (typically last resort) with specialist tools.

Likely causes

  • Broken or corroded connector pins at the solenoid harness
  • Shift solenoid A coil resistance out of specification (open circuit)
  • Short to ground in the solenoid control circuit
  • Solenoid valve stuck closed/open due to debris or varnish in valve body
  • Low ATF level or degraded fluid causing sluggish solenoid movement

Fault status

⚠️ Status
P0751 - Shift Solenoid A Performance/Stuck Off: solenoid failed to respond correctly to PCM command (electrical or hydraulic fault).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P0750 P0752 P0700 P0730 P0760
320

Browse 320 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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Code

P0751

MERCEDES-BENZ P — Powertrain

Shift Solenoid A Performance or Stuck Off

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

Causes

  • Open or shorted wiring between PCM and shift solenoid A
  • Failed shift solenoid A (coil open or internal short)
  • Stuck valve or contamination in valve body (hydraulic blockage)
  • Low/contaminated automatic transmission fluid (ATF)
  • Poor ground at transmission or PCM
  • Faulty PCM/TCM (less common)

Symptoms

  • Check engine/shift light illuminated
  • Harsh, delayed, or missing shifts
  • Transmission stuck in one gear or limp/limitation mode
  • Erratic or harsh downshifts
  • No engagement into certain gears or slipping
  • Poor drivability under load

What to check

  • Scan for stored codes and freeze-frame data; record related transmission codes
  • Check automatic transmission fluid level and condition (color, smell, contamination)
  • Visually inspect transmission harness and connector for damage, corrosion, bent pins, or water intrusion
  • Perform active test or command shift solenoid A with a scan tool and observe response
  • Back-probe solenoid connector while commanding to measure voltage/duty and ground
  • Measure solenoid coil resistance with an ohmmeter (compare to spec)

Signal parameters

  • Solenoid coil resistance: check manufacturer spec (typical range ~5–30 Ω; values vary by design)
  • Voltage at solenoid connector: ~battery voltage (11–14 V) when PCM supplies power, or pulsed ground/duty cycle signal depending on circuit type
  • Command signal: PCM may use a switched 12V or switched ground or PWM duty-cycle control (0–100% duty)
  • Current draw: typical solenoid currents commonly range 0.2–2 A (vehicle-specific)
  • Activation response: mechanical valve should move promptly when energized; delayed or no movement indicates hydraulic/mechanical or electrical failure

Diagnostic algorithm

  1. Retrieve all transmission-related and engine codes, note freeze-frame and conditions. Clear codes and attempt to re-run to confirm repeatability.
  2. Check ATF level and condition; correct level and, if heavily contaminated, consider fluid/ filter service before further electrical diagnostics.
  3. Inspect the solenoid harness connector and wiring for damage, corrosion, bent pins, or moisture. Repair as needed.
  4. With a scan tool, command (activate) shift solenoid A and observe scanner feedback and transmission behavior. If the tool can show actual commanded vs. reported status, record results.
  5. Back-probe the solenoid connector while commanding: verify expected voltage or pulsed ground signal at the correct times. If no command present, suspect PCM or wiring upstream.
  6. With ignition OFF, measure solenoid coil resistance at the connector; compare to specification. Infinite/open or short to ground/voltage indicates solenoid or internal short.
  7. Check continuity between solenoid connector and PCM pin; check for shorts to ground or battery. Repair any wiring faults.
  8. If electrical tests are good but solenoid does not operate or shifts remain abnormal, remove valve body or solenoid assembly to inspect for debris, stuck valve, or hydraulic faults. Clean or replace valve body/solenoid as required.
  9. After repair or replacement, clear codes, perform relearn/procedure if manufacturer specifies, and road-test to verify proper shift operation and that code does not return.
  10. If wiring, solenoid, and valve body are good, consider PCM/TCM fault diagnosis (typically last resort) with specialist tools.

Likely causes

  • Broken or corroded connector pins at the solenoid harness
  • Shift solenoid A coil resistance out of specification (open circuit)
  • Short to ground in the solenoid control circuit
  • Solenoid valve stuck closed/open due to debris or varnish in valve body
  • Low ATF level or degraded fluid causing sluggish solenoid movement

Fault status

⚠️ Status
P0751 - Shift Solenoid A Performance/Stuck Off: solenoid failed to respond correctly to PCM command (electrical or hydraulic fault).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P0750 P0752 P0700 P0730 P0760
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.
Send to email

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