Code
P0747
Generic
P — Powertrain
Pressure Control Solenoid A Stuck On
Views:
UK: 21
EN: 40
RU: 29
AI status
Completed
Completed
100%
Causes
- Faulty pressure control solenoid (mechanically stuck or shorted)
- Short to battery or short to ground in solenoid wiring
- Open or high-resistance wiring/poor connector contact
- Contaminated transmission fluid or clogged valve body passages
- Low or degraded transmission fluid
- Faulty transmission control module (TCM) or powertrain control module (PCM)
Symptoms
- Check Engine / MIL illuminated
- Harsh, delayed or erratic shifting
- Transmission slipping or poor lock-up
- Vehicle may enter limp/reduced-gear mode
- Reduced fuel economy or drivability issues
What to check
- Read and record freeze-frame and live data with an OEM-level scan tool
- Verify transmission fluid level and condition (color, smell, contamination)
- Visually inspect solenoid connector and harness for damage, corrosion, or pin push-out
- Measure solenoid coil resistance with connector disconnected
- Backprobe connector to check supply voltage and switched/PWM signal while commanding solenoid ON/OFF
- Check for shorts to battery/ground and continuity to module
Signal parameters
- Supply voltage: approximately battery voltage (~12 V) present at power feed circuit
- Control: PWM duty cycle from 0–100% (varies by vehicle/strategy)
- Typical coil resistance: generally in the low-ohm range (approx. 6–30 Ω) — consult vehicle-specific spec
- When commanded OFF: driver output should be near 0% duty and coil should see no continuous ground
- When commanded ON: driver applies PWM/ground; measured duty and voltage will vary with load and TCM strategy
Diagnostic algorithm
- Use a scan tool: read codes, freeze frame, and live data. Confirm P0747 is active and note conditions.
- Verify fluid: check level and condition; if very low or contaminated, correct fluid and retest.
- Visual inspection: unplug connector, inspect pins and harness for corrosion, breaks, or rodent damage.
- Measure resistance: disconnect solenoid and measure coil resistance against vehicle spec.
- Backprobe and test: with ignition on/engine running and scanner commanding solenoid, backprobe power and control circuits to confirm supply voltage and control signal (PWM/duty cycle).
- Check for shorts: test for short to battery or ground and for open circuits between solenoid and TCM.
- Functional test: if wiring and signals are correct, remove and bench-test or swap solenoid with a known-good unit.
- Valve body/filter: if solenoid is mechanically sticking or bench test fails intermittently, inspect valve body and replace filter; clean or repair valve body as required.
- Module check: if wiring and solenoid test good, verify TCM/PCM driver outputs and consider module fault as last resort.
- Repair, clear codes, and perform road test and re-scan to confirm resolution.
Likely causes
- Damaged wiring or corroded/loose connector at the solenoid
- Failed solenoid coil (internal short or welded spool)
- Debris or varnish in valve body preventing solenoid/valve movement
- Low fluid level or very dirty fluid causing sluggish operation
- Module driver failure (less common)
Fault status
Status
P0747 - Transmission Pressure Control Solenoid A Stuck On. Indicates the solenoid circuit or valve is continuously energized or not responding to control commands.
Repair difficulty: Medium
Diagnostic time: 1-3 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
👎 Dislike
0
Send to email
Code
P0747
GWM
P — Powertrain
- Pressure solenoid damaged
Views:
UK: 1
EN: 3
RU: 2
AI status
Completed
Completed
100%
Causes
- Faulty pressure control solenoid (mechanically stuck or shorted)
- Short to battery or short to ground in solenoid wiring
- Open or high-resistance wiring/poor connector contact
- Contaminated transmission fluid or clogged valve body passages
- Low or degraded transmission fluid
- Faulty transmission control module (TCM) or powertrain control module (PCM)
Symptoms
- Check Engine / MIL illuminated
- Harsh, delayed or erratic shifting
- Transmission slipping or poor lock-up
- Vehicle may enter limp/reduced-gear mode
- Reduced fuel economy or drivability issues
What to check
- Read and record freeze-frame and live data with an OEM-level scan tool
- Verify transmission fluid level and condition (color, smell, contamination)
- Visually inspect solenoid connector and harness for damage, corrosion, or pin push-out
- Measure solenoid coil resistance with connector disconnected
- Backprobe connector to check supply voltage and switched/PWM signal while commanding solenoid ON/OFF
- Check for shorts to battery/ground and continuity to module
Signal parameters
- Supply voltage: approximately battery voltage (~12 V) present at power feed circuit
- Control: PWM duty cycle from 0–100% (varies by vehicle/strategy)
- Typical coil resistance: generally in the low-ohm range (approx. 6–30 Ω) — consult vehicle-specific spec
- When commanded OFF: driver output should be near 0% duty and coil should see no continuous ground
- When commanded ON: driver applies PWM/ground; measured duty and voltage will vary with load and TCM strategy
Diagnostic algorithm
- Use a scan tool: read codes, freeze frame, and live data. Confirm P0747 is active and note conditions.
- Verify fluid: check level and condition; if very low or contaminated, correct fluid and retest.
- Visual inspection: unplug connector, inspect pins and harness for corrosion, breaks, or rodent damage.
- Measure resistance: disconnect solenoid and measure coil resistance against vehicle spec.
- Backprobe and test: with ignition on/engine running and scanner commanding solenoid, backprobe power and control circuits to confirm supply voltage and control signal (PWM/duty cycle).
- Check for shorts: test for short to battery or ground and for open circuits between solenoid and TCM.
- Functional test: if wiring and signals are correct, remove and bench-test or swap solenoid with a known-good unit.
- Valve body/filter: if solenoid is mechanically sticking or bench test fails intermittently, inspect valve body and replace filter; clean or repair valve body as required.
- Module check: if wiring and solenoid test good, verify TCM/PCM driver outputs and consider module fault as last resort.
- Repair, clear codes, and perform road test and re-scan to confirm resolution.
Likely causes
- Damaged wiring or corroded/loose connector at the solenoid
- Failed solenoid coil (internal short or welded spool)
- Debris or varnish in valve body preventing solenoid/valve movement
- Low fluid level or very dirty fluid causing sluggish operation
- Module driver failure (less common)
Fault status
Status
P0747 - Transmission Pressure Control Solenoid A Stuck On. Indicates the solenoid circuit or valve is continuously energized or not responding to control commands.
Repair difficulty: Medium
Diagnostic time: 1-3 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
👎 Dislike
0
Send to email
Code
P0747
HUMMER
P — Powertrain
Pressure Control Solenoid Stuck On
Views:
UK: 7
EN: 11
RU: 13
AI status
Completed
Completed
100%
Causes
- Faulty pressure control solenoid (mechanically stuck or shorted)
- Short to battery or short to ground in solenoid wiring
- Open or high-resistance wiring/poor connector contact
- Contaminated transmission fluid or clogged valve body passages
- Low or degraded transmission fluid
- Faulty transmission control module (TCM) or powertrain control module (PCM)
Symptoms
- Check Engine / MIL illuminated
- Harsh, delayed or erratic shifting
- Transmission slipping or poor lock-up
- Vehicle may enter limp/reduced-gear mode
- Reduced fuel economy or drivability issues
What to check
- Read and record freeze-frame and live data with an OEM-level scan tool
- Verify transmission fluid level and condition (color, smell, contamination)
- Visually inspect solenoid connector and harness for damage, corrosion, or pin push-out
- Measure solenoid coil resistance with connector disconnected
- Backprobe connector to check supply voltage and switched/PWM signal while commanding solenoid ON/OFF
- Check for shorts to battery/ground and continuity to module
Signal parameters
- Supply voltage: approximately battery voltage (~12 V) present at power feed circuit
- Control: PWM duty cycle from 0–100% (varies by vehicle/strategy)
- Typical coil resistance: generally in the low-ohm range (approx. 6–30 Ω) — consult vehicle-specific spec
- When commanded OFF: driver output should be near 0% duty and coil should see no continuous ground
- When commanded ON: driver applies PWM/ground; measured duty and voltage will vary with load and TCM strategy
Diagnostic algorithm
- Use a scan tool: read codes, freeze frame, and live data. Confirm P0747 is active and note conditions.
- Verify fluid: check level and condition; if very low or contaminated, correct fluid and retest.
- Visual inspection: unplug connector, inspect pins and harness for corrosion, breaks, or rodent damage.
- Measure resistance: disconnect solenoid and measure coil resistance against vehicle spec.
- Backprobe and test: with ignition on/engine running and scanner commanding solenoid, backprobe power and control circuits to confirm supply voltage and control signal (PWM/duty cycle).
- Check for shorts: test for short to battery or ground and for open circuits between solenoid and TCM.
- Functional test: if wiring and signals are correct, remove and bench-test or swap solenoid with a known-good unit.
- Valve body/filter: if solenoid is mechanically sticking or bench test fails intermittently, inspect valve body and replace filter; clean or repair valve body as required.
- Module check: if wiring and solenoid test good, verify TCM/PCM driver outputs and consider module fault as last resort.
- Repair, clear codes, and perform road test and re-scan to confirm resolution.
Likely causes
- Damaged wiring or corroded/loose connector at the solenoid
- Failed solenoid coil (internal short or welded spool)
- Debris or varnish in valve body preventing solenoid/valve movement
- Low fluid level or very dirty fluid causing sluggish operation
- Module driver failure (less common)
Fault status
Status
P0747 - Transmission Pressure Control Solenoid A Stuck On. Indicates the solenoid circuit or valve is continuously energized or not responding to control commands.
Repair difficulty: Medium
Diagnostic time: 1-3 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
👎 Dislike
0
Send to email
Code
P0747
MERCEDES-BENZ
P — Powertrain
Pressure Control Solenoid Stuck On
Views:
UK: 15
EN: 31
RU: 20
AI status
Completed
Completed
100%
Causes
- Faulty pressure control solenoid (mechanically stuck or shorted)
- Short to battery or short to ground in solenoid wiring
- Open or high-resistance wiring/poor connector contact
- Contaminated transmission fluid or clogged valve body passages
- Low or degraded transmission fluid
- Faulty transmission control module (TCM) or powertrain control module (PCM)
Symptoms
- Check Engine / MIL illuminated
- Harsh, delayed or erratic shifting
- Transmission slipping or poor lock-up
- Vehicle may enter limp/reduced-gear mode
- Reduced fuel economy or drivability issues
What to check
- Read and record freeze-frame and live data with an OEM-level scan tool
- Verify transmission fluid level and condition (color, smell, contamination)
- Visually inspect solenoid connector and harness for damage, corrosion, or pin push-out
- Measure solenoid coil resistance with connector disconnected
- Backprobe connector to check supply voltage and switched/PWM signal while commanding solenoid ON/OFF
- Check for shorts to battery/ground and continuity to module
Signal parameters
- Supply voltage: approximately battery voltage (~12 V) present at power feed circuit
- Control: PWM duty cycle from 0–100% (varies by vehicle/strategy)
- Typical coil resistance: generally in the low-ohm range (approx. 6–30 Ω) — consult vehicle-specific spec
- When commanded OFF: driver output should be near 0% duty and coil should see no continuous ground
- When commanded ON: driver applies PWM/ground; measured duty and voltage will vary with load and TCM strategy
Diagnostic algorithm
- Use a scan tool: read codes, freeze frame, and live data. Confirm P0747 is active and note conditions.
- Verify fluid: check level and condition; if very low or contaminated, correct fluid and retest.
- Visual inspection: unplug connector, inspect pins and harness for corrosion, breaks, or rodent damage.
- Measure resistance: disconnect solenoid and measure coil resistance against vehicle spec.
- Backprobe and test: with ignition on/engine running and scanner commanding solenoid, backprobe power and control circuits to confirm supply voltage and control signal (PWM/duty cycle).
- Check for shorts: test for short to battery or ground and for open circuits between solenoid and TCM.
- Functional test: if wiring and signals are correct, remove and bench-test or swap solenoid with a known-good unit.
- Valve body/filter: if solenoid is mechanically sticking or bench test fails intermittently, inspect valve body and replace filter; clean or repair valve body as required.
- Module check: if wiring and solenoid test good, verify TCM/PCM driver outputs and consider module fault as last resort.
- Repair, clear codes, and perform road test and re-scan to confirm resolution.
Likely causes
- Damaged wiring or corroded/loose connector at the solenoid
- Failed solenoid coil (internal short or welded spool)
- Debris or varnish in valve body preventing solenoid/valve movement
- Low fluid level or very dirty fluid causing sluggish operation
- Module driver failure (less common)
Fault status
Status
P0747 - Transmission Pressure Control Solenoid A Stuck On. Indicates the solenoid circuit or valve is continuously energized or not responding to control commands.
Repair difficulty: Medium
Diagnostic time: 1-3 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
👎 Dislike
0
Send to email