Code
P1238
AUDI
P — Powertrain
Manufacturer-Specific Powertrain Fault (P1238)
Views:
UK: 10
EN: 9
RU: 10
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring in the monitored circuit
- Corroded, loose or damaged connector or ground
- Failed sensor or actuator associated with the monitored circuit
- Faulty fuse, relay or power supply to the circuit
- Intermittent fault caused by vibration or heat (broken wire or pin)
- Faulty ECM or control module software/calibration
Symptoms
- Malfunction indicator lamp (MIL) illuminated
- Reduced engine performance or limp mode (if ECM limits functions)
- Rough idle, hesitation or misfire-like symptoms
- Hard starting or no-start in some cases
- Degraded fuel economy or drivability issues
- Intermittent faults that appear under specific conditions (temperature, load)
What to check
- Read and record all stored codes and freeze frame data with a professional scan tool
- Check for related manufacturer-specific codes that may point to subsystem
- Inspect wiring harness and connectors at the suspected sensor/actuator for corrosion, damage or loose pins
- Verify battery voltage and main grounds; low supply can cause false codes
- Check fuses and relays that feed the suspect circuit
- Perform wiggle test while monitoring relevant live data for intermittent changes
Signal parameters
- Most sensor reference voltages: 5.0 V reference and ground present (measure at sensor connector)
- Typical sensor signal range: 0–5.0 V (varies by sensor type)
- CAN bus nominal idle voltage ~2.5 V (verify network communications if code references messages)
- PWM actuators: duty cycle 0–100% and frequencies from tens to thousands of Hz (measure with scope)
- Resistance checks: expected Ohms vary by component — consult OEM specs before replacing
Diagnostic algorithm
- Connect a capable OEM‑level or pro scan tool; read all DTCs and freeze frame. Note conditions when code set (RPM, load, temp, voltage).
- Check for technical service bulletins (TSBs) or software updates for P1238 on the specific Audi model/year.
- Visually inspect related harnesses, connectors and grounds; repair any physical damage. Ensure connectors are fully seated and pins straight.
- Verify power and ground at the suspect sensor/actuator connector with ignition on; compare to OEM reference voltages.
- Backprobe the signal wire while monitoring live data; verify signal behaves within expected range under varying engine conditions. Use oscilloscope for PWM or noisy signals.
- Check fuses and relays that supply the circuit; replace if suspect. Perform relay swap test if applicable.
- Perform continuity and resistance checks on wiring between sensor and ECM; repair any open/short. Wiggle harness while monitoring for intermittent faults.
- If wiring and power/grounds are good, substitute a known‑good sensor or actuator (if available) or bench‑test the component to confirm failure.
- If component replacement fixes the fault, clear codes and road test to verify. If issue persists and wiring/component good, consider ECM diagnosis or reflash by dealer/authorized shop.
- Document repairs and retest; if intermittent, leave vehicle for extended road test or install data logger to capture failing conditions.
Likely causes
- Damaged wiring/connector (water ingress, chafing)
- Failed sensor or actuator in the monitored circuit
- Bad ground or supply voltage to sensor/actuator
- Blown fuse or bad relay feeding the circuit
- Intermittent connector contact or pin damage
Fault status
Status
Manufacturer‑specific powertrain fault detected (P1238). ECM observed an abnormal signal; further diagnosis of circuit, sensor/actuator, wiring, power/ground or control module required.
Repair difficulty: Medium
Diagnostic time: 0.8-2.5 hours
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Code
P1238
FORD
P — Powertrain
Fuel Pump Secondary Circuit Fault
Views:
UK: 33
EN: 50
RU: 39
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring in the monitored circuit
- Corroded, loose or damaged connector or ground
- Failed sensor or actuator associated with the monitored circuit
- Faulty fuse, relay or power supply to the circuit
- Intermittent fault caused by vibration or heat (broken wire or pin)
- Faulty ECM or control module software/calibration
Symptoms
- Malfunction indicator lamp (MIL) illuminated
- Reduced engine performance or limp mode (if ECM limits functions)
- Rough idle, hesitation or misfire-like symptoms
- Hard starting or no-start in some cases
- Degraded fuel economy or drivability issues
- Intermittent faults that appear under specific conditions (temperature, load)
What to check
- Read and record all stored codes and freeze frame data with a professional scan tool
- Check for related manufacturer-specific codes that may point to subsystem
- Inspect wiring harness and connectors at the suspected sensor/actuator for corrosion, damage or loose pins
- Verify battery voltage and main grounds; low supply can cause false codes
- Check fuses and relays that feed the suspect circuit
- Perform wiggle test while monitoring relevant live data for intermittent changes
Signal parameters
- Most sensor reference voltages: 5.0 V reference and ground present (measure at sensor connector)
- Typical sensor signal range: 0–5.0 V (varies by sensor type)
- CAN bus nominal idle voltage ~2.5 V (verify network communications if code references messages)
- PWM actuators: duty cycle 0–100% and frequencies from tens to thousands of Hz (measure with scope)
- Resistance checks: expected Ohms vary by component — consult OEM specs before replacing
Diagnostic algorithm
- Connect a capable OEM‑level or pro scan tool; read all DTCs and freeze frame. Note conditions when code set (RPM, load, temp, voltage).
- Check for technical service bulletins (TSBs) or software updates for P1238 on the specific Audi model/year.
- Visually inspect related harnesses, connectors and grounds; repair any physical damage. Ensure connectors are fully seated and pins straight.
- Verify power and ground at the suspect sensor/actuator connector with ignition on; compare to OEM reference voltages.
- Backprobe the signal wire while monitoring live data; verify signal behaves within expected range under varying engine conditions. Use oscilloscope for PWM or noisy signals.
- Check fuses and relays that supply the circuit; replace if suspect. Perform relay swap test if applicable.
- Perform continuity and resistance checks on wiring between sensor and ECM; repair any open/short. Wiggle harness while monitoring for intermittent faults.
- If wiring and power/grounds are good, substitute a known‑good sensor or actuator (if available) or bench‑test the component to confirm failure.
- If component replacement fixes the fault, clear codes and road test to verify. If issue persists and wiring/component good, consider ECM diagnosis or reflash by dealer/authorized shop.
- Document repairs and retest; if intermittent, leave vehicle for extended road test or install data logger to capture failing conditions.
Likely causes
- Damaged wiring/connector (water ingress, chafing)
- Failed sensor or actuator in the monitored circuit
- Bad ground or supply voltage to sensor/actuator
- Blown fuse or bad relay feeding the circuit
- Intermittent connector contact or pin damage
Fault status
Status
Manufacturer‑specific powertrain fault detected (P1238). ECM observed an abnormal signal; further diagnosis of circuit, sensor/actuator, wiring, power/ground or control module required.
Repair difficulty: Medium
Diagnostic time: 0.8-2.5 hours
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Code
P1238
JAGUAR
P — Powertrain
VSV 3 Circuit
Views:
UK: 29
EN: 46
RU: 36
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring in the monitored circuit
- Corroded, loose or damaged connector or ground
- Failed sensor or actuator associated with the monitored circuit
- Faulty fuse, relay or power supply to the circuit
- Intermittent fault caused by vibration or heat (broken wire or pin)
- Faulty ECM or control module software/calibration
Symptoms
- Malfunction indicator lamp (MIL) illuminated
- Reduced engine performance or limp mode (if ECM limits functions)
- Rough idle, hesitation or misfire-like symptoms
- Hard starting or no-start in some cases
- Degraded fuel economy or drivability issues
- Intermittent faults that appear under specific conditions (temperature, load)
What to check
- Read and record all stored codes and freeze frame data with a professional scan tool
- Check for related manufacturer-specific codes that may point to subsystem
- Inspect wiring harness and connectors at the suspected sensor/actuator for corrosion, damage or loose pins
- Verify battery voltage and main grounds; low supply can cause false codes
- Check fuses and relays that feed the suspect circuit
- Perform wiggle test while monitoring relevant live data for intermittent changes
Signal parameters
- Most sensor reference voltages: 5.0 V reference and ground present (measure at sensor connector)
- Typical sensor signal range: 0–5.0 V (varies by sensor type)
- CAN bus nominal idle voltage ~2.5 V (verify network communications if code references messages)
- PWM actuators: duty cycle 0–100% and frequencies from tens to thousands of Hz (measure with scope)
- Resistance checks: expected Ohms vary by component — consult OEM specs before replacing
Diagnostic algorithm
- Connect a capable OEM‑level or pro scan tool; read all DTCs and freeze frame. Note conditions when code set (RPM, load, temp, voltage).
- Check for technical service bulletins (TSBs) or software updates for P1238 on the specific Audi model/year.
- Visually inspect related harnesses, connectors and grounds; repair any physical damage. Ensure connectors are fully seated and pins straight.
- Verify power and ground at the suspect sensor/actuator connector with ignition on; compare to OEM reference voltages.
- Backprobe the signal wire while monitoring live data; verify signal behaves within expected range under varying engine conditions. Use oscilloscope for PWM or noisy signals.
- Check fuses and relays that supply the circuit; replace if suspect. Perform relay swap test if applicable.
- Perform continuity and resistance checks on wiring between sensor and ECM; repair any open/short. Wiggle harness while monitoring for intermittent faults.
- If wiring and power/grounds are good, substitute a known‑good sensor or actuator (if available) or bench‑test the component to confirm failure.
- If component replacement fixes the fault, clear codes and road test to verify. If issue persists and wiring/component good, consider ECM diagnosis or reflash by dealer/authorized shop.
- Document repairs and retest; if intermittent, leave vehicle for extended road test or install data logger to capture failing conditions.
Likely causes
- Damaged wiring/connector (water ingress, chafing)
- Failed sensor or actuator in the monitored circuit
- Bad ground or supply voltage to sensor/actuator
- Blown fuse or bad relay feeding the circuit
- Intermittent connector contact or pin damage
Fault status
Status
Manufacturer‑specific powertrain fault detected (P1238). ECM observed an abnormal signal; further diagnosis of circuit, sensor/actuator, wiring, power/ground or control module required.
Repair difficulty: Medium
Diagnostic time: 0.8-2.5 hours
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Code
P1238
LAND ROVER
P — Powertrain
Vacuum switching valve 3 circuit malfunction
Views:
UK: 9
EN: 23
RU: 19
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring in the monitored circuit
- Corroded, loose or damaged connector or ground
- Failed sensor or actuator associated with the monitored circuit
- Faulty fuse, relay or power supply to the circuit
- Intermittent fault caused by vibration or heat (broken wire or pin)
- Faulty ECM or control module software/calibration
Symptoms
- Malfunction indicator lamp (MIL) illuminated
- Reduced engine performance or limp mode (if ECM limits functions)
- Rough idle, hesitation or misfire-like symptoms
- Hard starting or no-start in some cases
- Degraded fuel economy or drivability issues
- Intermittent faults that appear under specific conditions (temperature, load)
What to check
- Read and record all stored codes and freeze frame data with a professional scan tool
- Check for related manufacturer-specific codes that may point to subsystem
- Inspect wiring harness and connectors at the suspected sensor/actuator for corrosion, damage or loose pins
- Verify battery voltage and main grounds; low supply can cause false codes
- Check fuses and relays that feed the suspect circuit
- Perform wiggle test while monitoring relevant live data for intermittent changes
Signal parameters
- Most sensor reference voltages: 5.0 V reference and ground present (measure at sensor connector)
- Typical sensor signal range: 0–5.0 V (varies by sensor type)
- CAN bus nominal idle voltage ~2.5 V (verify network communications if code references messages)
- PWM actuators: duty cycle 0–100% and frequencies from tens to thousands of Hz (measure with scope)
- Resistance checks: expected Ohms vary by component — consult OEM specs before replacing
Diagnostic algorithm
- Connect a capable OEM‑level or pro scan tool; read all DTCs and freeze frame. Note conditions when code set (RPM, load, temp, voltage).
- Check for technical service bulletins (TSBs) or software updates for P1238 on the specific Audi model/year.
- Visually inspect related harnesses, connectors and grounds; repair any physical damage. Ensure connectors are fully seated and pins straight.
- Verify power and ground at the suspect sensor/actuator connector with ignition on; compare to OEM reference voltages.
- Backprobe the signal wire while monitoring live data; verify signal behaves within expected range under varying engine conditions. Use oscilloscope for PWM or noisy signals.
- Check fuses and relays that supply the circuit; replace if suspect. Perform relay swap test if applicable.
- Perform continuity and resistance checks on wiring between sensor and ECM; repair any open/short. Wiggle harness while monitoring for intermittent faults.
- If wiring and power/grounds are good, substitute a known‑good sensor or actuator (if available) or bench‑test the component to confirm failure.
- If component replacement fixes the fault, clear codes and road test to verify. If issue persists and wiring/component good, consider ECM diagnosis or reflash by dealer/authorized shop.
- Document repairs and retest; if intermittent, leave vehicle for extended road test or install data logger to capture failing conditions.
Likely causes
- Damaged wiring/connector (water ingress, chafing)
- Failed sensor or actuator in the monitored circuit
- Bad ground or supply voltage to sensor/actuator
- Blown fuse or bad relay feeding the circuit
- Intermittent connector contact or pin damage
Fault status
Status
Manufacturer‑specific powertrain fault detected (P1238). ECM observed an abnormal signal; further diagnosis of circuit, sensor/actuator, wiring, power/ground or control module required.
Repair difficulty: Medium
Diagnostic time: 0.8-2.5 hours
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Code
P1238
LINCOLN
P — Powertrain
Fuel Pump Secondary Circuit Fault
Views:
UK: 30
EN: 43
RU: 38
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring in the monitored circuit
- Corroded, loose or damaged connector or ground
- Failed sensor or actuator associated with the monitored circuit
- Faulty fuse, relay or power supply to the circuit
- Intermittent fault caused by vibration or heat (broken wire or pin)
- Faulty ECM or control module software/calibration
Symptoms
- Malfunction indicator lamp (MIL) illuminated
- Reduced engine performance or limp mode (if ECM limits functions)
- Rough idle, hesitation or misfire-like symptoms
- Hard starting or no-start in some cases
- Degraded fuel economy or drivability issues
- Intermittent faults that appear under specific conditions (temperature, load)
What to check
- Read and record all stored codes and freeze frame data with a professional scan tool
- Check for related manufacturer-specific codes that may point to subsystem
- Inspect wiring harness and connectors at the suspected sensor/actuator for corrosion, damage or loose pins
- Verify battery voltage and main grounds; low supply can cause false codes
- Check fuses and relays that feed the suspect circuit
- Perform wiggle test while monitoring relevant live data for intermittent changes
Signal parameters
- Most sensor reference voltages: 5.0 V reference and ground present (measure at sensor connector)
- Typical sensor signal range: 0–5.0 V (varies by sensor type)
- CAN bus nominal idle voltage ~2.5 V (verify network communications if code references messages)
- PWM actuators: duty cycle 0–100% and frequencies from tens to thousands of Hz (measure with scope)
- Resistance checks: expected Ohms vary by component — consult OEM specs before replacing
Diagnostic algorithm
- Connect a capable OEM‑level or pro scan tool; read all DTCs and freeze frame. Note conditions when code set (RPM, load, temp, voltage).
- Check for technical service bulletins (TSBs) or software updates for P1238 on the specific Audi model/year.
- Visually inspect related harnesses, connectors and grounds; repair any physical damage. Ensure connectors are fully seated and pins straight.
- Verify power and ground at the suspect sensor/actuator connector with ignition on; compare to OEM reference voltages.
- Backprobe the signal wire while monitoring live data; verify signal behaves within expected range under varying engine conditions. Use oscilloscope for PWM or noisy signals.
- Check fuses and relays that supply the circuit; replace if suspect. Perform relay swap test if applicable.
- Perform continuity and resistance checks on wiring between sensor and ECM; repair any open/short. Wiggle harness while monitoring for intermittent faults.
- If wiring and power/grounds are good, substitute a known‑good sensor or actuator (if available) or bench‑test the component to confirm failure.
- If component replacement fixes the fault, clear codes and road test to verify. If issue persists and wiring/component good, consider ECM diagnosis or reflash by dealer/authorized shop.
- Document repairs and retest; if intermittent, leave vehicle for extended road test or install data logger to capture failing conditions.
Likely causes
- Damaged wiring/connector (water ingress, chafing)
- Failed sensor or actuator in the monitored circuit
- Bad ground or supply voltage to sensor/actuator
- Blown fuse or bad relay feeding the circuit
- Intermittent connector contact or pin damage
Fault status
Status
Manufacturer‑specific powertrain fault detected (P1238). ECM observed an abnormal signal; further diagnosis of circuit, sensor/actuator, wiring, power/ground or control module required.
Repair difficulty: Medium
Diagnostic time: 0.8-2.5 hours
Similar codes
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Code
P1238
MERCURY
P — Powertrain
Fuel Pump Secondary Circuit Fault
Views:
UK: 25
EN: 46
RU: 34
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring in the monitored circuit
- Corroded, loose or damaged connector or ground
- Failed sensor or actuator associated with the monitored circuit
- Faulty fuse, relay or power supply to the circuit
- Intermittent fault caused by vibration or heat (broken wire or pin)
- Faulty ECM or control module software/calibration
Symptoms
- Malfunction indicator lamp (MIL) illuminated
- Reduced engine performance or limp mode (if ECM limits functions)
- Rough idle, hesitation or misfire-like symptoms
- Hard starting or no-start in some cases
- Degraded fuel economy or drivability issues
- Intermittent faults that appear under specific conditions (temperature, load)
What to check
- Read and record all stored codes and freeze frame data with a professional scan tool
- Check for related manufacturer-specific codes that may point to subsystem
- Inspect wiring harness and connectors at the suspected sensor/actuator for corrosion, damage or loose pins
- Verify battery voltage and main grounds; low supply can cause false codes
- Check fuses and relays that feed the suspect circuit
- Perform wiggle test while monitoring relevant live data for intermittent changes
Signal parameters
- Most sensor reference voltages: 5.0 V reference and ground present (measure at sensor connector)
- Typical sensor signal range: 0–5.0 V (varies by sensor type)
- CAN bus nominal idle voltage ~2.5 V (verify network communications if code references messages)
- PWM actuators: duty cycle 0–100% and frequencies from tens to thousands of Hz (measure with scope)
- Resistance checks: expected Ohms vary by component — consult OEM specs before replacing
Diagnostic algorithm
- Connect a capable OEM‑level or pro scan tool; read all DTCs and freeze frame. Note conditions when code set (RPM, load, temp, voltage).
- Check for technical service bulletins (TSBs) or software updates for P1238 on the specific Audi model/year.
- Visually inspect related harnesses, connectors and grounds; repair any physical damage. Ensure connectors are fully seated and pins straight.
- Verify power and ground at the suspect sensor/actuator connector with ignition on; compare to OEM reference voltages.
- Backprobe the signal wire while monitoring live data; verify signal behaves within expected range under varying engine conditions. Use oscilloscope for PWM or noisy signals.
- Check fuses and relays that supply the circuit; replace if suspect. Perform relay swap test if applicable.
- Perform continuity and resistance checks on wiring between sensor and ECM; repair any open/short. Wiggle harness while monitoring for intermittent faults.
- If wiring and power/grounds are good, substitute a known‑good sensor or actuator (if available) or bench‑test the component to confirm failure.
- If component replacement fixes the fault, clear codes and road test to verify. If issue persists and wiring/component good, consider ECM diagnosis or reflash by dealer/authorized shop.
- Document repairs and retest; if intermittent, leave vehicle for extended road test or install data logger to capture failing conditions.
Likely causes
- Damaged wiring/connector (water ingress, chafing)
- Failed sensor or actuator in the monitored circuit
- Bad ground or supply voltage to sensor/actuator
- Blown fuse or bad relay feeding the circuit
- Intermittent connector contact or pin damage
Fault status
Status
Manufacturer‑specific powertrain fault detected (P1238). ECM observed an abnormal signal; further diagnosis of circuit, sensor/actuator, wiring, power/ground or control module required.
Repair difficulty: Medium
Diagnostic time: 0.8-2.5 hours
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0
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Code
P1238
MINI
P — Powertrain
Manifold absolute pressure (MAP) sensor 2 - high input
Views:
UK: 12
EN: 20
RU: 17
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring in the monitored circuit
- Corroded, loose or damaged connector or ground
- Failed sensor or actuator associated with the monitored circuit
- Faulty fuse, relay or power supply to the circuit
- Intermittent fault caused by vibration or heat (broken wire or pin)
- Faulty ECM or control module software/calibration
Symptoms
- Malfunction indicator lamp (MIL) illuminated
- Reduced engine performance or limp mode (if ECM limits functions)
- Rough idle, hesitation or misfire-like symptoms
- Hard starting or no-start in some cases
- Degraded fuel economy or drivability issues
- Intermittent faults that appear under specific conditions (temperature, load)
What to check
- Read and record all stored codes and freeze frame data with a professional scan tool
- Check for related manufacturer-specific codes that may point to subsystem
- Inspect wiring harness and connectors at the suspected sensor/actuator for corrosion, damage or loose pins
- Verify battery voltage and main grounds; low supply can cause false codes
- Check fuses and relays that feed the suspect circuit
- Perform wiggle test while monitoring relevant live data for intermittent changes
Signal parameters
- Most sensor reference voltages: 5.0 V reference and ground present (measure at sensor connector)
- Typical sensor signal range: 0–5.0 V (varies by sensor type)
- CAN bus nominal idle voltage ~2.5 V (verify network communications if code references messages)
- PWM actuators: duty cycle 0–100% and frequencies from tens to thousands of Hz (measure with scope)
- Resistance checks: expected Ohms vary by component — consult OEM specs before replacing
Diagnostic algorithm
- Connect a capable OEM‑level or pro scan tool; read all DTCs and freeze frame. Note conditions when code set (RPM, load, temp, voltage).
- Check for technical service bulletins (TSBs) or software updates for P1238 on the specific Audi model/year.
- Visually inspect related harnesses, connectors and grounds; repair any physical damage. Ensure connectors are fully seated and pins straight.
- Verify power and ground at the suspect sensor/actuator connector with ignition on; compare to OEM reference voltages.
- Backprobe the signal wire while monitoring live data; verify signal behaves within expected range under varying engine conditions. Use oscilloscope for PWM or noisy signals.
- Check fuses and relays that supply the circuit; replace if suspect. Perform relay swap test if applicable.
- Perform continuity and resistance checks on wiring between sensor and ECM; repair any open/short. Wiggle harness while monitoring for intermittent faults.
- If wiring and power/grounds are good, substitute a known‑good sensor or actuator (if available) or bench‑test the component to confirm failure.
- If component replacement fixes the fault, clear codes and road test to verify. If issue persists and wiring/component good, consider ECM diagnosis or reflash by dealer/authorized shop.
- Document repairs and retest; if intermittent, leave vehicle for extended road test or install data logger to capture failing conditions.
Likely causes
- Damaged wiring/connector (water ingress, chafing)
- Failed sensor or actuator in the monitored circuit
- Bad ground or supply voltage to sensor/actuator
- Blown fuse or bad relay feeding the circuit
- Intermittent connector contact or pin damage
Fault status
Status
Manufacturer‑specific powertrain fault detected (P1238). ECM observed an abnormal signal; further diagnosis of circuit, sensor/actuator, wiring, power/ground or control module required.
Repair difficulty: Medium
Diagnostic time: 0.8-2.5 hours
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Code
P1238
MITSUBISHI
P — Powertrain
AFS plausibility(torque monitor)
Views:
UK: 13
EN: 29
RU: 25
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring in the monitored circuit
- Corroded, loose or damaged connector or ground
- Failed sensor or actuator associated with the monitored circuit
- Faulty fuse, relay or power supply to the circuit
- Intermittent fault caused by vibration or heat (broken wire or pin)
- Faulty ECM or control module software/calibration
Symptoms
- Malfunction indicator lamp (MIL) illuminated
- Reduced engine performance or limp mode (if ECM limits functions)
- Rough idle, hesitation or misfire-like symptoms
- Hard starting or no-start in some cases
- Degraded fuel economy or drivability issues
- Intermittent faults that appear under specific conditions (temperature, load)
What to check
- Read and record all stored codes and freeze frame data with a professional scan tool
- Check for related manufacturer-specific codes that may point to subsystem
- Inspect wiring harness and connectors at the suspected sensor/actuator for corrosion, damage or loose pins
- Verify battery voltage and main grounds; low supply can cause false codes
- Check fuses and relays that feed the suspect circuit
- Perform wiggle test while monitoring relevant live data for intermittent changes
Signal parameters
- Most sensor reference voltages: 5.0 V reference and ground present (measure at sensor connector)
- Typical sensor signal range: 0–5.0 V (varies by sensor type)
- CAN bus nominal idle voltage ~2.5 V (verify network communications if code references messages)
- PWM actuators: duty cycle 0–100% and frequencies from tens to thousands of Hz (measure with scope)
- Resistance checks: expected Ohms vary by component — consult OEM specs before replacing
Diagnostic algorithm
- Connect a capable OEM‑level or pro scan tool; read all DTCs and freeze frame. Note conditions when code set (RPM, load, temp, voltage).
- Check for technical service bulletins (TSBs) or software updates for P1238 on the specific Audi model/year.
- Visually inspect related harnesses, connectors and grounds; repair any physical damage. Ensure connectors are fully seated and pins straight.
- Verify power and ground at the suspect sensor/actuator connector with ignition on; compare to OEM reference voltages.
- Backprobe the signal wire while monitoring live data; verify signal behaves within expected range under varying engine conditions. Use oscilloscope for PWM or noisy signals.
- Check fuses and relays that supply the circuit; replace if suspect. Perform relay swap test if applicable.
- Perform continuity and resistance checks on wiring between sensor and ECM; repair any open/short. Wiggle harness while monitoring for intermittent faults.
- If wiring and power/grounds are good, substitute a known‑good sensor or actuator (if available) or bench‑test the component to confirm failure.
- If component replacement fixes the fault, clear codes and road test to verify. If issue persists and wiring/component good, consider ECM diagnosis or reflash by dealer/authorized shop.
- Document repairs and retest; if intermittent, leave vehicle for extended road test or install data logger to capture failing conditions.
Likely causes
- Damaged wiring/connector (water ingress, chafing)
- Failed sensor or actuator in the monitored circuit
- Bad ground or supply voltage to sensor/actuator
- Blown fuse or bad relay feeding the circuit
- Intermittent connector contact or pin damage
Fault status
Status
Manufacturer‑specific powertrain fault detected (P1238). ECM observed an abnormal signal; further diagnosis of circuit, sensor/actuator, wiring, power/ground or control module required.
Repair difficulty: Medium
Diagnostic time: 0.8-2.5 hours
Similar codes
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Send to email
Code
P1238
Other
P — Powertrain
Fuel Pump Secondary Circuit Malfunction
Views:
UK: 24
EN: 42
RU: 32
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring in the monitored circuit
- Corroded, loose or damaged connector or ground
- Failed sensor or actuator associated with the monitored circuit
- Faulty fuse, relay or power supply to the circuit
- Intermittent fault caused by vibration or heat (broken wire or pin)
- Faulty ECM or control module software/calibration
Symptoms
- Malfunction indicator lamp (MIL) illuminated
- Reduced engine performance or limp mode (if ECM limits functions)
- Rough idle, hesitation or misfire-like symptoms
- Hard starting or no-start in some cases
- Degraded fuel economy or drivability issues
- Intermittent faults that appear under specific conditions (temperature, load)
What to check
- Read and record all stored codes and freeze frame data with a professional scan tool
- Check for related manufacturer-specific codes that may point to subsystem
- Inspect wiring harness and connectors at the suspected sensor/actuator for corrosion, damage or loose pins
- Verify battery voltage and main grounds; low supply can cause false codes
- Check fuses and relays that feed the suspect circuit
- Perform wiggle test while monitoring relevant live data for intermittent changes
Signal parameters
- Most sensor reference voltages: 5.0 V reference and ground present (measure at sensor connector)
- Typical sensor signal range: 0–5.0 V (varies by sensor type)
- CAN bus nominal idle voltage ~2.5 V (verify network communications if code references messages)
- PWM actuators: duty cycle 0–100% and frequencies from tens to thousands of Hz (measure with scope)
- Resistance checks: expected Ohms vary by component — consult OEM specs before replacing
Diagnostic algorithm
- Connect a capable OEM‑level or pro scan tool; read all DTCs and freeze frame. Note conditions when code set (RPM, load, temp, voltage).
- Check for technical service bulletins (TSBs) or software updates for P1238 on the specific Audi model/year.
- Visually inspect related harnesses, connectors and grounds; repair any physical damage. Ensure connectors are fully seated and pins straight.
- Verify power and ground at the suspect sensor/actuator connector with ignition on; compare to OEM reference voltages.
- Backprobe the signal wire while monitoring live data; verify signal behaves within expected range under varying engine conditions. Use oscilloscope for PWM or noisy signals.
- Check fuses and relays that supply the circuit; replace if suspect. Perform relay swap test if applicable.
- Perform continuity and resistance checks on wiring between sensor and ECM; repair any open/short. Wiggle harness while monitoring for intermittent faults.
- If wiring and power/grounds are good, substitute a known‑good sensor or actuator (if available) or bench‑test the component to confirm failure.
- If component replacement fixes the fault, clear codes and road test to verify. If issue persists and wiring/component good, consider ECM diagnosis or reflash by dealer/authorized shop.
- Document repairs and retest; if intermittent, leave vehicle for extended road test or install data logger to capture failing conditions.
Likely causes
- Damaged wiring/connector (water ingress, chafing)
- Failed sensor or actuator in the monitored circuit
- Bad ground or supply voltage to sensor/actuator
- Blown fuse or bad relay feeding the circuit
- Intermittent connector contact or pin damage
Fault status
Status
Manufacturer‑specific powertrain fault detected (P1238). ECM observed an abnormal signal; further diagnosis of circuit, sensor/actuator, wiring, power/ground or control module required.
Repair difficulty: Medium
Diagnostic time: 0.8-2.5 hours
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Code
P1238
PORSCHE
P — Powertrain
Fuel injector, cylinder 2
Views:
UK: 10
EN: 17
RU: 14
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring in the monitored circuit
- Corroded, loose or damaged connector or ground
- Failed sensor or actuator associated with the monitored circuit
- Faulty fuse, relay or power supply to the circuit
- Intermittent fault caused by vibration or heat (broken wire or pin)
- Faulty ECM or control module software/calibration
Symptoms
- Malfunction indicator lamp (MIL) illuminated
- Reduced engine performance or limp mode (if ECM limits functions)
- Rough idle, hesitation or misfire-like symptoms
- Hard starting or no-start in some cases
- Degraded fuel economy or drivability issues
- Intermittent faults that appear under specific conditions (temperature, load)
What to check
- Read and record all stored codes and freeze frame data with a professional scan tool
- Check for related manufacturer-specific codes that may point to subsystem
- Inspect wiring harness and connectors at the suspected sensor/actuator for corrosion, damage or loose pins
- Verify battery voltage and main grounds; low supply can cause false codes
- Check fuses and relays that feed the suspect circuit
- Perform wiggle test while monitoring relevant live data for intermittent changes
Signal parameters
- Most sensor reference voltages: 5.0 V reference and ground present (measure at sensor connector)
- Typical sensor signal range: 0–5.0 V (varies by sensor type)
- CAN bus nominal idle voltage ~2.5 V (verify network communications if code references messages)
- PWM actuators: duty cycle 0–100% and frequencies from tens to thousands of Hz (measure with scope)
- Resistance checks: expected Ohms vary by component — consult OEM specs before replacing
Diagnostic algorithm
- Connect a capable OEM‑level or pro scan tool; read all DTCs and freeze frame. Note conditions when code set (RPM, load, temp, voltage).
- Check for technical service bulletins (TSBs) or software updates for P1238 on the specific Audi model/year.
- Visually inspect related harnesses, connectors and grounds; repair any physical damage. Ensure connectors are fully seated and pins straight.
- Verify power and ground at the suspect sensor/actuator connector with ignition on; compare to OEM reference voltages.
- Backprobe the signal wire while monitoring live data; verify signal behaves within expected range under varying engine conditions. Use oscilloscope for PWM or noisy signals.
- Check fuses and relays that supply the circuit; replace if suspect. Perform relay swap test if applicable.
- Perform continuity and resistance checks on wiring between sensor and ECM; repair any open/short. Wiggle harness while monitoring for intermittent faults.
- If wiring and power/grounds are good, substitute a known‑good sensor or actuator (if available) or bench‑test the component to confirm failure.
- If component replacement fixes the fault, clear codes and road test to verify. If issue persists and wiring/component good, consider ECM diagnosis or reflash by dealer/authorized shop.
- Document repairs and retest; if intermittent, leave vehicle for extended road test or install data logger to capture failing conditions.
Likely causes
- Damaged wiring/connector (water ingress, chafing)
- Failed sensor or actuator in the monitored circuit
- Bad ground or supply voltage to sensor/actuator
- Blown fuse or bad relay feeding the circuit
- Intermittent connector contact or pin damage
Fault status
Status
Manufacturer‑specific powertrain fault detected (P1238). ECM observed an abnormal signal; further diagnosis of circuit, sensor/actuator, wiring, power/ground or control module required.
Repair difficulty: Medium
Diagnostic time: 0.8-2.5 hours
Similar codes
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Code
P1238
SAAB
P — Powertrain
Injector Circuit Cyl. 2 Open Or Short To Ground
Views:
UK: 16
EN: 20
RU: 20
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring in the monitored circuit
- Corroded, loose or damaged connector or ground
- Failed sensor or actuator associated with the monitored circuit
- Faulty fuse, relay or power supply to the circuit
- Intermittent fault caused by vibration or heat (broken wire or pin)
- Faulty ECM or control module software/calibration
Symptoms
- Malfunction indicator lamp (MIL) illuminated
- Reduced engine performance or limp mode (if ECM limits functions)
- Rough idle, hesitation or misfire-like symptoms
- Hard starting or no-start in some cases
- Degraded fuel economy or drivability issues
- Intermittent faults that appear under specific conditions (temperature, load)
What to check
- Read and record all stored codes and freeze frame data with a professional scan tool
- Check for related manufacturer-specific codes that may point to subsystem
- Inspect wiring harness and connectors at the suspected sensor/actuator for corrosion, damage or loose pins
- Verify battery voltage and main grounds; low supply can cause false codes
- Check fuses and relays that feed the suspect circuit
- Perform wiggle test while monitoring relevant live data for intermittent changes
Signal parameters
- Most sensor reference voltages: 5.0 V reference and ground present (measure at sensor connector)
- Typical sensor signal range: 0–5.0 V (varies by sensor type)
- CAN bus nominal idle voltage ~2.5 V (verify network communications if code references messages)
- PWM actuators: duty cycle 0–100% and frequencies from tens to thousands of Hz (measure with scope)
- Resistance checks: expected Ohms vary by component — consult OEM specs before replacing
Diagnostic algorithm
- Connect a capable OEM‑level or pro scan tool; read all DTCs and freeze frame. Note conditions when code set (RPM, load, temp, voltage).
- Check for technical service bulletins (TSBs) or software updates for P1238 on the specific Audi model/year.
- Visually inspect related harnesses, connectors and grounds; repair any physical damage. Ensure connectors are fully seated and pins straight.
- Verify power and ground at the suspect sensor/actuator connector with ignition on; compare to OEM reference voltages.
- Backprobe the signal wire while monitoring live data; verify signal behaves within expected range under varying engine conditions. Use oscilloscope for PWM or noisy signals.
- Check fuses and relays that supply the circuit; replace if suspect. Perform relay swap test if applicable.
- Perform continuity and resistance checks on wiring between sensor and ECM; repair any open/short. Wiggle harness while monitoring for intermittent faults.
- If wiring and power/grounds are good, substitute a known‑good sensor or actuator (if available) or bench‑test the component to confirm failure.
- If component replacement fixes the fault, clear codes and road test to verify. If issue persists and wiring/component good, consider ECM diagnosis or reflash by dealer/authorized shop.
- Document repairs and retest; if intermittent, leave vehicle for extended road test or install data logger to capture failing conditions.
Likely causes
- Damaged wiring/connector (water ingress, chafing)
- Failed sensor or actuator in the monitored circuit
- Bad ground or supply voltage to sensor/actuator
- Blown fuse or bad relay feeding the circuit
- Intermittent connector contact or pin damage
Fault status
Status
Manufacturer‑specific powertrain fault detected (P1238). ECM observed an abnormal signal; further diagnosis of circuit, sensor/actuator, wiring, power/ground or control module required.
Repair difficulty: Medium
Diagnostic time: 0.8-2.5 hours
Similar codes
Your experience will help others
+100 karma for a short comment :)
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Code
P1238
VOLKSWAGEN
P — Powertrain
Cylinder 2 Injector Circuit Open Circuit
Views:
UK: 24
EN: 45
RU: 40
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring in the monitored circuit
- Corroded, loose or damaged connector or ground
- Failed sensor or actuator associated with the monitored circuit
- Faulty fuse, relay or power supply to the circuit
- Intermittent fault caused by vibration or heat (broken wire or pin)
- Faulty ECM or control module software/calibration
Symptoms
- Malfunction indicator lamp (MIL) illuminated
- Reduced engine performance or limp mode (if ECM limits functions)
- Rough idle, hesitation or misfire-like symptoms
- Hard starting or no-start in some cases
- Degraded fuel economy or drivability issues
- Intermittent faults that appear under specific conditions (temperature, load)
What to check
- Read and record all stored codes and freeze frame data with a professional scan tool
- Check for related manufacturer-specific codes that may point to subsystem
- Inspect wiring harness and connectors at the suspected sensor/actuator for corrosion, damage or loose pins
- Verify battery voltage and main grounds; low supply can cause false codes
- Check fuses and relays that feed the suspect circuit
- Perform wiggle test while monitoring relevant live data for intermittent changes
Signal parameters
- Most sensor reference voltages: 5.0 V reference and ground present (measure at sensor connector)
- Typical sensor signal range: 0–5.0 V (varies by sensor type)
- CAN bus nominal idle voltage ~2.5 V (verify network communications if code references messages)
- PWM actuators: duty cycle 0–100% and frequencies from tens to thousands of Hz (measure with scope)
- Resistance checks: expected Ohms vary by component — consult OEM specs before replacing
Diagnostic algorithm
- Connect a capable OEM‑level or pro scan tool; read all DTCs and freeze frame. Note conditions when code set (RPM, load, temp, voltage).
- Check for technical service bulletins (TSBs) or software updates for P1238 on the specific Audi model/year.
- Visually inspect related harnesses, connectors and grounds; repair any physical damage. Ensure connectors are fully seated and pins straight.
- Verify power and ground at the suspect sensor/actuator connector with ignition on; compare to OEM reference voltages.
- Backprobe the signal wire while monitoring live data; verify signal behaves within expected range under varying engine conditions. Use oscilloscope for PWM or noisy signals.
- Check fuses and relays that supply the circuit; replace if suspect. Perform relay swap test if applicable.
- Perform continuity and resistance checks on wiring between sensor and ECM; repair any open/short. Wiggle harness while monitoring for intermittent faults.
- If wiring and power/grounds are good, substitute a known‑good sensor or actuator (if available) or bench‑test the component to confirm failure.
- If component replacement fixes the fault, clear codes and road test to verify. If issue persists and wiring/component good, consider ECM diagnosis or reflash by dealer/authorized shop.
- Document repairs and retest; if intermittent, leave vehicle for extended road test or install data logger to capture failing conditions.
Likely causes
- Damaged wiring/connector (water ingress, chafing)
- Failed sensor or actuator in the monitored circuit
- Bad ground or supply voltage to sensor/actuator
- Blown fuse or bad relay feeding the circuit
- Intermittent connector contact or pin damage
Fault status
Status
Manufacturer‑specific powertrain fault detected (P1238). ECM observed an abnormal signal; further diagnosis of circuit, sensor/actuator, wiring, power/ground or control module required.
Repair difficulty: Medium
Diagnostic time: 0.8-2.5 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
👎 Dislike
0
Send to email