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Home / DTC / P0756 — Shift Solenoid B Performance/Stuck Off

P0756 — Shift Solenoid B Performance/Stuck Off

Detailed page for trouble code P0756.

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22,491specific
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Code

P0756

Generic P — Powertrain

Shift Solenoid B Performance/Stuck Off

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

Causes

  • Open or shorted wiring to shift solenoid B
  • Corroded or loose connector at solenoid or TCM
  • Faulty shift solenoid (electrical or mechanical failure)
  • Contaminated, low, or degraded transmission fluid
  • Valve body or hydraulic circuit blockage/sticking
  • Faulty transmission control module (TCM) or module software

Symptoms

  • Check Engine / MIL lamp illuminated
  • Transmission may be stuck in one gear or fail to shift into specific gear(s)
  • Harsh, delayed, or erratic shifts
  • Reduced performance / limp-in mode
  • Surging or slipping under load
  • Possible transmission fluid leaks or burnt-smelling fluid

What to check

  • Scan for P0756 and any related transmission codes; note freeze frame and live data
  • Inspect transmission fluid level, color and smell for contamination or overheating
  • Visually inspect wiring and connectors at the solenoid and TCM for corrosion, damage or looseness
  • Backprobe solenoid connector with ignition on to verify TCM output and ground
  • Measure solenoid coil resistance with ohmmeter and compare to spec
  • Check continuity from solenoid harness to TCM pins and for shorts to battery and ground

Signal parameters

  • Control: TCM switches solenoid between battery voltage and ground or uses PWM (duty 0–100%)
  • Typical coil resistance (varies by design): roughly 10–60 ohms — consult vehicle spec
  • Operating voltage at connector when commanded: near battery voltage (~12V) or PWM waveform
  • Typical PWM frequency: commonly 40–250 Hz (vehicle-specific)
  • Current draw while energized: typically under a few amps; high current suggests short or stuck plunger

Diagnostic algorithm

  1. Read and record codes and freeze-frame data. Clear codes then attempt to reproduce to confirm persistence of P0756.
  2. Check transmission fluid level and condition. If fluid is contaminated or burnt, consider service and retest; debris can cause solenoid sticking.
  3. Perform a visual inspection of the solenoid connector and wiring harness for damage, corrosion, or poor pins. Repair any obvious issues.
  4. With ignition off, unplug solenoid connector and measure coil resistance; compare to factory spec. Infinite/open or very low resistance indicates a bad coil or short.
  5. With a backprobe and scan tool (or lab scope), command the TCM to actuate Solenoid B and observe voltage/PWM and the solenoid response. No command or incorrect waveform may indicate TCM or wiring fault.
  6. Check continuity between solenoid pin and TCM pin with ignition off. Also check for shorts to battery and chassis ground.
  7. If wiring and solenoid electrical tests pass, perform a bench or on-vehicle activation test (fused 12V applied briefly, or use scan tool) to see if solenoid moves; listen for clicking. Do not apply power long-term without proper current limiting.
  8. If solenoid fails electrical/hydraulic tests, replace the solenoid and retest. If multiple solenoids are identical and diagnosis unclear, swapping with a known-good solenoid can show whether issue follows the part.
  9. If new solenoid does not resolve, inspect valve body and hydraulic circuits for blockage or sticking spools; perform transmission pressure tests as needed.
  10. If wiring, solenoid, and hydraulic tests are good, investigate TCM output driver or software; consult manufacturer service info before replacing TCM.

Likely causes

  • Damaged wiring harness or chafed insulation to the solenoid
  • Failed solenoid coil (open circuit or intermittent)
  • Connector corrosion or bent terminals at solenoid/TCM
  • Debris in transmission causing solenoid spool to stick
  • Poor electrical ground or battery voltage problems

Fault status

⚠️ Status
Transmission control module reports Shift Solenoid B performance fault or solenoid stuck off. May cause incorrect shifting or limp mode; further electrical and hydraulic diagnosis required.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P0751 P0752 P0753 P0754 P0755 P0757
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Code

P0756

GWM P — Powertrain

- B solenoid switch B is not correctly adjusted

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

Causes

  • Open or shorted wiring to shift solenoid B
  • Corroded or loose connector at solenoid or TCM
  • Faulty shift solenoid (electrical or mechanical failure)
  • Contaminated, low, or degraded transmission fluid
  • Valve body or hydraulic circuit blockage/sticking
  • Faulty transmission control module (TCM) or module software

Symptoms

  • Check Engine / MIL lamp illuminated
  • Transmission may be stuck in one gear or fail to shift into specific gear(s)
  • Harsh, delayed, or erratic shifts
  • Reduced performance / limp-in mode
  • Surging or slipping under load
  • Possible transmission fluid leaks or burnt-smelling fluid

What to check

  • Scan for P0756 and any related transmission codes; note freeze frame and live data
  • Inspect transmission fluid level, color and smell for contamination or overheating
  • Visually inspect wiring and connectors at the solenoid and TCM for corrosion, damage or looseness
  • Backprobe solenoid connector with ignition on to verify TCM output and ground
  • Measure solenoid coil resistance with ohmmeter and compare to spec
  • Check continuity from solenoid harness to TCM pins and for shorts to battery and ground

Signal parameters

  • Control: TCM switches solenoid between battery voltage and ground or uses PWM (duty 0–100%)
  • Typical coil resistance (varies by design): roughly 10–60 ohms — consult vehicle spec
  • Operating voltage at connector when commanded: near battery voltage (~12V) or PWM waveform
  • Typical PWM frequency: commonly 40–250 Hz (vehicle-specific)
  • Current draw while energized: typically under a few amps; high current suggests short or stuck plunger

Diagnostic algorithm

  1. Read and record codes and freeze-frame data. Clear codes then attempt to reproduce to confirm persistence of P0756.
  2. Check transmission fluid level and condition. If fluid is contaminated or burnt, consider service and retest; debris can cause solenoid sticking.
  3. Perform a visual inspection of the solenoid connector and wiring harness for damage, corrosion, or poor pins. Repair any obvious issues.
  4. With ignition off, unplug solenoid connector and measure coil resistance; compare to factory spec. Infinite/open or very low resistance indicates a bad coil or short.
  5. With a backprobe and scan tool (or lab scope), command the TCM to actuate Solenoid B and observe voltage/PWM and the solenoid response. No command or incorrect waveform may indicate TCM or wiring fault.
  6. Check continuity between solenoid pin and TCM pin with ignition off. Also check for shorts to battery and chassis ground.
  7. If wiring and solenoid electrical tests pass, perform a bench or on-vehicle activation test (fused 12V applied briefly, or use scan tool) to see if solenoid moves; listen for clicking. Do not apply power long-term without proper current limiting.
  8. If solenoid fails electrical/hydraulic tests, replace the solenoid and retest. If multiple solenoids are identical and diagnosis unclear, swapping with a known-good solenoid can show whether issue follows the part.
  9. If new solenoid does not resolve, inspect valve body and hydraulic circuits for blockage or sticking spools; perform transmission pressure tests as needed.
  10. If wiring, solenoid, and hydraulic tests are good, investigate TCM output driver or software; consult manufacturer service info before replacing TCM.

Likely causes

  • Damaged wiring harness or chafed insulation to the solenoid
  • Failed solenoid coil (open circuit or intermittent)
  • Connector corrosion or bent terminals at solenoid/TCM
  • Debris in transmission causing solenoid spool to stick
  • Poor electrical ground or battery voltage problems

Fault status

⚠️ Status
Transmission control module reports Shift Solenoid B performance fault or solenoid stuck off. May cause incorrect shifting or limp mode; further electrical and hydraulic diagnosis required.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P0751 P0752 P0753 P0754 P0755 P0757
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Code

P0756

HUMMER P — Powertrain

2-3 Shift Solenoid Valve Performance - No First or Second Gear

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

Causes

  • Open or shorted wiring to shift solenoid B
  • Corroded or loose connector at solenoid or TCM
  • Faulty shift solenoid (electrical or mechanical failure)
  • Contaminated, low, or degraded transmission fluid
  • Valve body or hydraulic circuit blockage/sticking
  • Faulty transmission control module (TCM) or module software

Symptoms

  • Check Engine / MIL lamp illuminated
  • Transmission may be stuck in one gear or fail to shift into specific gear(s)
  • Harsh, delayed, or erratic shifts
  • Reduced performance / limp-in mode
  • Surging or slipping under load
  • Possible transmission fluid leaks or burnt-smelling fluid

What to check

  • Scan for P0756 and any related transmission codes; note freeze frame and live data
  • Inspect transmission fluid level, color and smell for contamination or overheating
  • Visually inspect wiring and connectors at the solenoid and TCM for corrosion, damage or looseness
  • Backprobe solenoid connector with ignition on to verify TCM output and ground
  • Measure solenoid coil resistance with ohmmeter and compare to spec
  • Check continuity from solenoid harness to TCM pins and for shorts to battery and ground

Signal parameters

  • Control: TCM switches solenoid between battery voltage and ground or uses PWM (duty 0–100%)
  • Typical coil resistance (varies by design): roughly 10–60 ohms — consult vehicle spec
  • Operating voltage at connector when commanded: near battery voltage (~12V) or PWM waveform
  • Typical PWM frequency: commonly 40–250 Hz (vehicle-specific)
  • Current draw while energized: typically under a few amps; high current suggests short or stuck plunger

Diagnostic algorithm

  1. Read and record codes and freeze-frame data. Clear codes then attempt to reproduce to confirm persistence of P0756.
  2. Check transmission fluid level and condition. If fluid is contaminated or burnt, consider service and retest; debris can cause solenoid sticking.
  3. Perform a visual inspection of the solenoid connector and wiring harness for damage, corrosion, or poor pins. Repair any obvious issues.
  4. With ignition off, unplug solenoid connector and measure coil resistance; compare to factory spec. Infinite/open or very low resistance indicates a bad coil or short.
  5. With a backprobe and scan tool (or lab scope), command the TCM to actuate Solenoid B and observe voltage/PWM and the solenoid response. No command or incorrect waveform may indicate TCM or wiring fault.
  6. Check continuity between solenoid pin and TCM pin with ignition off. Also check for shorts to battery and chassis ground.
  7. If wiring and solenoid electrical tests pass, perform a bench or on-vehicle activation test (fused 12V applied briefly, or use scan tool) to see if solenoid moves; listen for clicking. Do not apply power long-term without proper current limiting.
  8. If solenoid fails electrical/hydraulic tests, replace the solenoid and retest. If multiple solenoids are identical and diagnosis unclear, swapping with a known-good solenoid can show whether issue follows the part.
  9. If new solenoid does not resolve, inspect valve body and hydraulic circuits for blockage or sticking spools; perform transmission pressure tests as needed.
  10. If wiring, solenoid, and hydraulic tests are good, investigate TCM output driver or software; consult manufacturer service info before replacing TCM.

Likely causes

  • Damaged wiring harness or chafed insulation to the solenoid
  • Failed solenoid coil (open circuit or intermittent)
  • Connector corrosion or bent terminals at solenoid/TCM
  • Debris in transmission causing solenoid spool to stick
  • Poor electrical ground or battery voltage problems

Fault status

⚠️ Status
Transmission control module reports Shift Solenoid B performance fault or solenoid stuck off. May cause incorrect shifting or limp mode; further electrical and hydraulic diagnosis required.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P0751 P0752 P0753 P0754 P0755 P0757
Repair manuals

Manual library for HUMMER

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Code

P0756

LAND ROVER P — Powertrain

Solenoid performance of change B

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

Causes

  • Open or shorted wiring to shift solenoid B
  • Corroded or loose connector at solenoid or TCM
  • Faulty shift solenoid (electrical or mechanical failure)
  • Contaminated, low, or degraded transmission fluid
  • Valve body or hydraulic circuit blockage/sticking
  • Faulty transmission control module (TCM) or module software

Symptoms

  • Check Engine / MIL lamp illuminated
  • Transmission may be stuck in one gear or fail to shift into specific gear(s)
  • Harsh, delayed, or erratic shifts
  • Reduced performance / limp-in mode
  • Surging or slipping under load
  • Possible transmission fluid leaks or burnt-smelling fluid

What to check

  • Scan for P0756 and any related transmission codes; note freeze frame and live data
  • Inspect transmission fluid level, color and smell for contamination or overheating
  • Visually inspect wiring and connectors at the solenoid and TCM for corrosion, damage or looseness
  • Backprobe solenoid connector with ignition on to verify TCM output and ground
  • Measure solenoid coil resistance with ohmmeter and compare to spec
  • Check continuity from solenoid harness to TCM pins and for shorts to battery and ground

Signal parameters

  • Control: TCM switches solenoid between battery voltage and ground or uses PWM (duty 0–100%)
  • Typical coil resistance (varies by design): roughly 10–60 ohms — consult vehicle spec
  • Operating voltage at connector when commanded: near battery voltage (~12V) or PWM waveform
  • Typical PWM frequency: commonly 40–250 Hz (vehicle-specific)
  • Current draw while energized: typically under a few amps; high current suggests short or stuck plunger

Diagnostic algorithm

  1. Read and record codes and freeze-frame data. Clear codes then attempt to reproduce to confirm persistence of P0756.
  2. Check transmission fluid level and condition. If fluid is contaminated or burnt, consider service and retest; debris can cause solenoid sticking.
  3. Perform a visual inspection of the solenoid connector and wiring harness for damage, corrosion, or poor pins. Repair any obvious issues.
  4. With ignition off, unplug solenoid connector and measure coil resistance; compare to factory spec. Infinite/open or very low resistance indicates a bad coil or short.
  5. With a backprobe and scan tool (or lab scope), command the TCM to actuate Solenoid B and observe voltage/PWM and the solenoid response. No command or incorrect waveform may indicate TCM or wiring fault.
  6. Check continuity between solenoid pin and TCM pin with ignition off. Also check for shorts to battery and chassis ground.
  7. If wiring and solenoid electrical tests pass, perform a bench or on-vehicle activation test (fused 12V applied briefly, or use scan tool) to see if solenoid moves; listen for clicking. Do not apply power long-term without proper current limiting.
  8. If solenoid fails electrical/hydraulic tests, replace the solenoid and retest. If multiple solenoids are identical and diagnosis unclear, swapping with a known-good solenoid can show whether issue follows the part.
  9. If new solenoid does not resolve, inspect valve body and hydraulic circuits for blockage or sticking spools; perform transmission pressure tests as needed.
  10. If wiring, solenoid, and hydraulic tests are good, investigate TCM output driver or software; consult manufacturer service info before replacing TCM.

Likely causes

  • Damaged wiring harness or chafed insulation to the solenoid
  • Failed solenoid coil (open circuit or intermittent)
  • Connector corrosion or bent terminals at solenoid/TCM
  • Debris in transmission causing solenoid spool to stick
  • Poor electrical ground or battery voltage problems

Fault status

⚠️ Status
Transmission control module reports Shift Solenoid B performance fault or solenoid stuck off. May cause incorrect shifting or limp mode; further electrical and hydraulic diagnosis required.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P0751 P0752 P0753 P0754 P0755 P0757
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

P0756

MERCEDES-BENZ P — Powertrain

Shift Solenoid B Performance or Stuck Off

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

Causes

  • Open or shorted wiring to shift solenoid B
  • Corroded or loose connector at solenoid or TCM
  • Faulty shift solenoid (electrical or mechanical failure)
  • Contaminated, low, or degraded transmission fluid
  • Valve body or hydraulic circuit blockage/sticking
  • Faulty transmission control module (TCM) or module software

Symptoms

  • Check Engine / MIL lamp illuminated
  • Transmission may be stuck in one gear or fail to shift into specific gear(s)
  • Harsh, delayed, or erratic shifts
  • Reduced performance / limp-in mode
  • Surging or slipping under load
  • Possible transmission fluid leaks or burnt-smelling fluid

What to check

  • Scan for P0756 and any related transmission codes; note freeze frame and live data
  • Inspect transmission fluid level, color and smell for contamination or overheating
  • Visually inspect wiring and connectors at the solenoid and TCM for corrosion, damage or looseness
  • Backprobe solenoid connector with ignition on to verify TCM output and ground
  • Measure solenoid coil resistance with ohmmeter and compare to spec
  • Check continuity from solenoid harness to TCM pins and for shorts to battery and ground

Signal parameters

  • Control: TCM switches solenoid between battery voltage and ground or uses PWM (duty 0–100%)
  • Typical coil resistance (varies by design): roughly 10–60 ohms — consult vehicle spec
  • Operating voltage at connector when commanded: near battery voltage (~12V) or PWM waveform
  • Typical PWM frequency: commonly 40–250 Hz (vehicle-specific)
  • Current draw while energized: typically under a few amps; high current suggests short or stuck plunger

Diagnostic algorithm

  1. Read and record codes and freeze-frame data. Clear codes then attempt to reproduce to confirm persistence of P0756.
  2. Check transmission fluid level and condition. If fluid is contaminated or burnt, consider service and retest; debris can cause solenoid sticking.
  3. Perform a visual inspection of the solenoid connector and wiring harness for damage, corrosion, or poor pins. Repair any obvious issues.
  4. With ignition off, unplug solenoid connector and measure coil resistance; compare to factory spec. Infinite/open or very low resistance indicates a bad coil or short.
  5. With a backprobe and scan tool (or lab scope), command the TCM to actuate Solenoid B and observe voltage/PWM and the solenoid response. No command or incorrect waveform may indicate TCM or wiring fault.
  6. Check continuity between solenoid pin and TCM pin with ignition off. Also check for shorts to battery and chassis ground.
  7. If wiring and solenoid electrical tests pass, perform a bench or on-vehicle activation test (fused 12V applied briefly, or use scan tool) to see if solenoid moves; listen for clicking. Do not apply power long-term without proper current limiting.
  8. If solenoid fails electrical/hydraulic tests, replace the solenoid and retest. If multiple solenoids are identical and diagnosis unclear, swapping with a known-good solenoid can show whether issue follows the part.
  9. If new solenoid does not resolve, inspect valve body and hydraulic circuits for blockage or sticking spools; perform transmission pressure tests as needed.
  10. If wiring, solenoid, and hydraulic tests are good, investigate TCM output driver or software; consult manufacturer service info before replacing TCM.

Likely causes

  • Damaged wiring harness or chafed insulation to the solenoid
  • Failed solenoid coil (open circuit or intermittent)
  • Connector corrosion or bent terminals at solenoid/TCM
  • Debris in transmission causing solenoid spool to stick
  • Poor electrical ground or battery voltage problems

Fault status

⚠️ Status
Transmission control module reports Shift Solenoid B performance fault or solenoid stuck off. May cause incorrect shifting or limp mode; further electrical and hydraulic diagnosis required.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P0751 P0752 P0753 P0754 P0755 P0757
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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