Code
P1250
BUICK
P — Powertrain
Early Fuel Evaporation Heater Circuit
Views:
UK: 28
EN: 34
RU: 25
AI status
Completed
Completed
100%
Causes
- Open or short in EVAP heater wiring
- Failed EVAP heater element (heater coil burned/open)
- Poor or corroded connector or terminal at the heater or ECU
- Blown fuse or failed relay supplying the heater circuit
- ECM/PCM driver fault or internal control module error
- Intermittent wiring damage (chafing, water intrusion)
Symptoms
- Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
- Stored P1250 code (may be accompanied by other EVAP codes)
- Possible poor cold start behavior or drivability complaints in rare cases
- Failed emissions test or elevated evaporative emissions
- Occasional fuel odor near EVAP canister area if purge operation affected
What to check
- Use a scan tool to read DTC, freeze frame data and EVAP heater commanded status
- Visually inspect wiring, connectors, and the heater element for damage or corrosion
- Check related fuses and relays for continuity and correct operation
- Backprobe the heater connector and monitor voltage/ground while commanding the heater ON/OFF with a scan tool
- Measure heater element resistance with multimeter at the connector (with power removed)
- Wiggle test wiring while monitoring circuit voltage or resistance for intermittent faults
Signal parameters
- Control signal: ECM commands ON/OFF (digital output) when EVAP heater is requested
- Expected supply voltage at heater connector: approximately battery voltage when commanded ON (typical 9–14 V)
- Heater element resistance: typically low (a few ohms); should not be open — exact value varies by model
- Current draw: moderate when energized; excessive current suggests short, very high/zero current suggests open circuit or open heater
Diagnostic algorithm
- Connect a scan tool, confirm P1250 and note freeze frame data; attempt to reproduce the fault
- Visually inspect EVAP heater, harness, connectors, fuses, and any associated relays for obvious damage or corrosion
- With ignition off, disconnect heater connector and measure resistance of the heater element to ground and between terminals — compare to service values or verify it is not open
- Check fuse(s) and relay feeding the heater circuit; replace if blown or faulty
- Reconnect and backprobe heater connector. With scan tool commanding heater ON, verify supply voltage and ground presence at the connector; no voltage indicates open feed or relay/fuse fault
- If voltage present but heater not drawing current, suspect open heater element or poor ground; bench-test the heater by applying fused 12 V briefly and observe function/resistance
- Inspect and repair any damaged wiring, connectors, or grounds found. If wiring and connector are good but heater still fails, replace heater element
- If wiring and heater test good, but ECM output does not switch or shows abnormal behavior, test or replace the relay or investigate ECM driver circuit; consult manufacturer procedures before replacing ECM
- Clear codes, perform readiness/functional test, and road-test to confirm code does not return
Likely causes
- Damaged or disconnected harness to EVAP heater
- Corroded or loose connector at the heater or ground
- Failed heater element (measured open or out-of-spec resistance)
- Blown inline fuse or failed relay in the heater supply
- Short to battery or ground caused by insulation failure
- Faulty ECM output stage (less common)
Fault status
Status
Electrical fault detected in the Early Fuel Evaporation (EVAP) Heater circuit. Possible open, short, high resistance, or control driver failure preventing proper heater operation.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1250
CADILLAC
P — Powertrain
Early Fuel Evaporation Heater Circuit
Views:
UK: 29
EN: 38
RU: 27
AI status
Completed
Completed
100%
Causes
- Open or short in EVAP heater wiring
- Failed EVAP heater element (heater coil burned/open)
- Poor or corroded connector or terminal at the heater or ECU
- Blown fuse or failed relay supplying the heater circuit
- ECM/PCM driver fault or internal control module error
- Intermittent wiring damage (chafing, water intrusion)
Symptoms
- Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
- Stored P1250 code (may be accompanied by other EVAP codes)
- Possible poor cold start behavior or drivability complaints in rare cases
- Failed emissions test or elevated evaporative emissions
- Occasional fuel odor near EVAP canister area if purge operation affected
What to check
- Use a scan tool to read DTC, freeze frame data and EVAP heater commanded status
- Visually inspect wiring, connectors, and the heater element for damage or corrosion
- Check related fuses and relays for continuity and correct operation
- Backprobe the heater connector and monitor voltage/ground while commanding the heater ON/OFF with a scan tool
- Measure heater element resistance with multimeter at the connector (with power removed)
- Wiggle test wiring while monitoring circuit voltage or resistance for intermittent faults
Signal parameters
- Control signal: ECM commands ON/OFF (digital output) when EVAP heater is requested
- Expected supply voltage at heater connector: approximately battery voltage when commanded ON (typical 9–14 V)
- Heater element resistance: typically low (a few ohms); should not be open — exact value varies by model
- Current draw: moderate when energized; excessive current suggests short, very high/zero current suggests open circuit or open heater
Diagnostic algorithm
- Connect a scan tool, confirm P1250 and note freeze frame data; attempt to reproduce the fault
- Visually inspect EVAP heater, harness, connectors, fuses, and any associated relays for obvious damage or corrosion
- With ignition off, disconnect heater connector and measure resistance of the heater element to ground and between terminals — compare to service values or verify it is not open
- Check fuse(s) and relay feeding the heater circuit; replace if blown or faulty
- Reconnect and backprobe heater connector. With scan tool commanding heater ON, verify supply voltage and ground presence at the connector; no voltage indicates open feed or relay/fuse fault
- If voltage present but heater not drawing current, suspect open heater element or poor ground; bench-test the heater by applying fused 12 V briefly and observe function/resistance
- Inspect and repair any damaged wiring, connectors, or grounds found. If wiring and connector are good but heater still fails, replace heater element
- If wiring and heater test good, but ECM output does not switch or shows abnormal behavior, test or replace the relay or investigate ECM driver circuit; consult manufacturer procedures before replacing ECM
- Clear codes, perform readiness/functional test, and road-test to confirm code does not return
Likely causes
- Damaged or disconnected harness to EVAP heater
- Corroded or loose connector at the heater or ground
- Failed heater element (measured open or out-of-spec resistance)
- Blown inline fuse or failed relay in the heater supply
- Short to battery or ground caused by insulation failure
- Faulty ECM output stage (less common)
Fault status
Status
Electrical fault detected in the Early Fuel Evaporation (EVAP) Heater circuit. Possible open, short, high resistance, or control driver failure preventing proper heater operation.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1250
CHEVROLET
P — Powertrain
Early Fuel Evaporation Heater Circuit
Views:
UK: 26
EN: 34
RU: 28
AI status
Completed
Completed
100%
Causes
- Open or short in EVAP heater wiring
- Failed EVAP heater element (heater coil burned/open)
- Poor or corroded connector or terminal at the heater or ECU
- Blown fuse or failed relay supplying the heater circuit
- ECM/PCM driver fault or internal control module error
- Intermittent wiring damage (chafing, water intrusion)
Symptoms
- Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
- Stored P1250 code (may be accompanied by other EVAP codes)
- Possible poor cold start behavior or drivability complaints in rare cases
- Failed emissions test or elevated evaporative emissions
- Occasional fuel odor near EVAP canister area if purge operation affected
What to check
- Use a scan tool to read DTC, freeze frame data and EVAP heater commanded status
- Visually inspect wiring, connectors, and the heater element for damage or corrosion
- Check related fuses and relays for continuity and correct operation
- Backprobe the heater connector and monitor voltage/ground while commanding the heater ON/OFF with a scan tool
- Measure heater element resistance with multimeter at the connector (with power removed)
- Wiggle test wiring while monitoring circuit voltage or resistance for intermittent faults
Signal parameters
- Control signal: ECM commands ON/OFF (digital output) when EVAP heater is requested
- Expected supply voltage at heater connector: approximately battery voltage when commanded ON (typical 9–14 V)
- Heater element resistance: typically low (a few ohms); should not be open — exact value varies by model
- Current draw: moderate when energized; excessive current suggests short, very high/zero current suggests open circuit or open heater
Diagnostic algorithm
- Connect a scan tool, confirm P1250 and note freeze frame data; attempt to reproduce the fault
- Visually inspect EVAP heater, harness, connectors, fuses, and any associated relays for obvious damage or corrosion
- With ignition off, disconnect heater connector and measure resistance of the heater element to ground and between terminals — compare to service values or verify it is not open
- Check fuse(s) and relay feeding the heater circuit; replace if blown or faulty
- Reconnect and backprobe heater connector. With scan tool commanding heater ON, verify supply voltage and ground presence at the connector; no voltage indicates open feed or relay/fuse fault
- If voltage present but heater not drawing current, suspect open heater element or poor ground; bench-test the heater by applying fused 12 V briefly and observe function/resistance
- Inspect and repair any damaged wiring, connectors, or grounds found. If wiring and connector are good but heater still fails, replace heater element
- If wiring and heater test good, but ECM output does not switch or shows abnormal behavior, test or replace the relay or investigate ECM driver circuit; consult manufacturer procedures before replacing ECM
- Clear codes, perform readiness/functional test, and road-test to confirm code does not return
Likely causes
- Damaged or disconnected harness to EVAP heater
- Corroded or loose connector at the heater or ground
- Failed heater element (measured open or out-of-spec resistance)
- Blown inline fuse or failed relay in the heater supply
- Short to battery or ground caused by insulation failure
- Faulty ECM output stage (less common)
Fault status
Status
Electrical fault detected in the Early Fuel Evaporation (EVAP) Heater circuit. Possible open, short, high resistance, or control driver failure preventing proper heater operation.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1250
CHRYSLER
P — Powertrain
Early Fuel Evaporation Heater Circuit
Views:
UK: 27
EN: 38
RU: 23
AI status
Completed
Completed
100%
Causes
- Open or short in EVAP heater wiring
- Failed EVAP heater element (heater coil burned/open)
- Poor or corroded connector or terminal at the heater or ECU
- Blown fuse or failed relay supplying the heater circuit
- ECM/PCM driver fault or internal control module error
- Intermittent wiring damage (chafing, water intrusion)
Symptoms
- Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
- Stored P1250 code (may be accompanied by other EVAP codes)
- Possible poor cold start behavior or drivability complaints in rare cases
- Failed emissions test or elevated evaporative emissions
- Occasional fuel odor near EVAP canister area if purge operation affected
What to check
- Use a scan tool to read DTC, freeze frame data and EVAP heater commanded status
- Visually inspect wiring, connectors, and the heater element for damage or corrosion
- Check related fuses and relays for continuity and correct operation
- Backprobe the heater connector and monitor voltage/ground while commanding the heater ON/OFF with a scan tool
- Measure heater element resistance with multimeter at the connector (with power removed)
- Wiggle test wiring while monitoring circuit voltage or resistance for intermittent faults
Signal parameters
- Control signal: ECM commands ON/OFF (digital output) when EVAP heater is requested
- Expected supply voltage at heater connector: approximately battery voltage when commanded ON (typical 9–14 V)
- Heater element resistance: typically low (a few ohms); should not be open — exact value varies by model
- Current draw: moderate when energized; excessive current suggests short, very high/zero current suggests open circuit or open heater
Diagnostic algorithm
- Connect a scan tool, confirm P1250 and note freeze frame data; attempt to reproduce the fault
- Visually inspect EVAP heater, harness, connectors, fuses, and any associated relays for obvious damage or corrosion
- With ignition off, disconnect heater connector and measure resistance of the heater element to ground and between terminals — compare to service values or verify it is not open
- Check fuse(s) and relay feeding the heater circuit; replace if blown or faulty
- Reconnect and backprobe heater connector. With scan tool commanding heater ON, verify supply voltage and ground presence at the connector; no voltage indicates open feed or relay/fuse fault
- If voltage present but heater not drawing current, suspect open heater element or poor ground; bench-test the heater by applying fused 12 V briefly and observe function/resistance
- Inspect and repair any damaged wiring, connectors, or grounds found. If wiring and connector are good but heater still fails, replace heater element
- If wiring and heater test good, but ECM output does not switch or shows abnormal behavior, test or replace the relay or investigate ECM driver circuit; consult manufacturer procedures before replacing ECM
- Clear codes, perform readiness/functional test, and road-test to confirm code does not return
Likely causes
- Damaged or disconnected harness to EVAP heater
- Corroded or loose connector at the heater or ground
- Failed heater element (measured open or out-of-spec resistance)
- Blown inline fuse or failed relay in the heater supply
- Short to battery or ground caused by insulation failure
- Faulty ECM output stage (less common)
Fault status
Status
Electrical fault detected in the Early Fuel Evaporation (EVAP) Heater circuit. Possible open, short, high resistance, or control driver failure preventing proper heater operation.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1250
FORD
P — Powertrain
Lack of Power to FPRC Solenoid
Views:
UK: 27
EN: 33
RU: 28
AI status
Completed
Completed
100%
Causes
- Open or short in EVAP heater wiring
- Failed EVAP heater element (heater coil burned/open)
- Poor or corroded connector or terminal at the heater or ECU
- Blown fuse or failed relay supplying the heater circuit
- ECM/PCM driver fault or internal control module error
- Intermittent wiring damage (chafing, water intrusion)
Symptoms
- Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
- Stored P1250 code (may be accompanied by other EVAP codes)
- Possible poor cold start behavior or drivability complaints in rare cases
- Failed emissions test or elevated evaporative emissions
- Occasional fuel odor near EVAP canister area if purge operation affected
What to check
- Use a scan tool to read DTC, freeze frame data and EVAP heater commanded status
- Visually inspect wiring, connectors, and the heater element for damage or corrosion
- Check related fuses and relays for continuity and correct operation
- Backprobe the heater connector and monitor voltage/ground while commanding the heater ON/OFF with a scan tool
- Measure heater element resistance with multimeter at the connector (with power removed)
- Wiggle test wiring while monitoring circuit voltage or resistance for intermittent faults
Signal parameters
- Control signal: ECM commands ON/OFF (digital output) when EVAP heater is requested
- Expected supply voltage at heater connector: approximately battery voltage when commanded ON (typical 9–14 V)
- Heater element resistance: typically low (a few ohms); should not be open — exact value varies by model
- Current draw: moderate when energized; excessive current suggests short, very high/zero current suggests open circuit or open heater
Diagnostic algorithm
- Connect a scan tool, confirm P1250 and note freeze frame data; attempt to reproduce the fault
- Visually inspect EVAP heater, harness, connectors, fuses, and any associated relays for obvious damage or corrosion
- With ignition off, disconnect heater connector and measure resistance of the heater element to ground and between terminals — compare to service values or verify it is not open
- Check fuse(s) and relay feeding the heater circuit; replace if blown or faulty
- Reconnect and backprobe heater connector. With scan tool commanding heater ON, verify supply voltage and ground presence at the connector; no voltage indicates open feed or relay/fuse fault
- If voltage present but heater not drawing current, suspect open heater element or poor ground; bench-test the heater by applying fused 12 V briefly and observe function/resistance
- Inspect and repair any damaged wiring, connectors, or grounds found. If wiring and connector are good but heater still fails, replace heater element
- If wiring and heater test good, but ECM output does not switch or shows abnormal behavior, test or replace the relay or investigate ECM driver circuit; consult manufacturer procedures before replacing ECM
- Clear codes, perform readiness/functional test, and road-test to confirm code does not return
Likely causes
- Damaged or disconnected harness to EVAP heater
- Corroded or loose connector at the heater or ground
- Failed heater element (measured open or out-of-spec resistance)
- Blown inline fuse or failed relay in the heater supply
- Short to battery or ground caused by insulation failure
- Faulty ECM output stage (less common)
Fault status
Status
Electrical fault detected in the Early Fuel Evaporation (EVAP) Heater circuit. Possible open, short, high resistance, or control driver failure preventing proper heater operation.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1250
GEO
P — Powertrain
Early Fuel Evaporation Heater Circuit Fault
Views:
UK: 26
EN: 33
RU: 26
AI status
Completed
Completed
100%
Causes
- Open or short in EVAP heater wiring
- Failed EVAP heater element (heater coil burned/open)
- Poor or corroded connector or terminal at the heater or ECU
- Blown fuse or failed relay supplying the heater circuit
- ECM/PCM driver fault or internal control module error
- Intermittent wiring damage (chafing, water intrusion)
Symptoms
- Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
- Stored P1250 code (may be accompanied by other EVAP codes)
- Possible poor cold start behavior or drivability complaints in rare cases
- Failed emissions test or elevated evaporative emissions
- Occasional fuel odor near EVAP canister area if purge operation affected
What to check
- Use a scan tool to read DTC, freeze frame data and EVAP heater commanded status
- Visually inspect wiring, connectors, and the heater element for damage or corrosion
- Check related fuses and relays for continuity and correct operation
- Backprobe the heater connector and monitor voltage/ground while commanding the heater ON/OFF with a scan tool
- Measure heater element resistance with multimeter at the connector (with power removed)
- Wiggle test wiring while monitoring circuit voltage or resistance for intermittent faults
Signal parameters
- Control signal: ECM commands ON/OFF (digital output) when EVAP heater is requested
- Expected supply voltage at heater connector: approximately battery voltage when commanded ON (typical 9–14 V)
- Heater element resistance: typically low (a few ohms); should not be open — exact value varies by model
- Current draw: moderate when energized; excessive current suggests short, very high/zero current suggests open circuit or open heater
Diagnostic algorithm
- Connect a scan tool, confirm P1250 and note freeze frame data; attempt to reproduce the fault
- Visually inspect EVAP heater, harness, connectors, fuses, and any associated relays for obvious damage or corrosion
- With ignition off, disconnect heater connector and measure resistance of the heater element to ground and between terminals — compare to service values or verify it is not open
- Check fuse(s) and relay feeding the heater circuit; replace if blown or faulty
- Reconnect and backprobe heater connector. With scan tool commanding heater ON, verify supply voltage and ground presence at the connector; no voltage indicates open feed or relay/fuse fault
- If voltage present but heater not drawing current, suspect open heater element or poor ground; bench-test the heater by applying fused 12 V briefly and observe function/resistance
- Inspect and repair any damaged wiring, connectors, or grounds found. If wiring and connector are good but heater still fails, replace heater element
- If wiring and heater test good, but ECM output does not switch or shows abnormal behavior, test or replace the relay or investigate ECM driver circuit; consult manufacturer procedures before replacing ECM
- Clear codes, perform readiness/functional test, and road-test to confirm code does not return
Likely causes
- Damaged or disconnected harness to EVAP heater
- Corroded or loose connector at the heater or ground
- Failed heater element (measured open or out-of-spec resistance)
- Blown inline fuse or failed relay in the heater supply
- Short to battery or ground caused by insulation failure
- Faulty ECM output stage (less common)
Fault status
Status
Electrical fault detected in the Early Fuel Evaporation (EVAP) Heater circuit. Possible open, short, high resistance, or control driver failure preventing proper heater operation.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1250
GM
P — Powertrain
Early Fuel Evaporation Heater Circuit
Views:
UK: 28
EN: 39
RU: 27
AI status
Completed
Completed
100%
Causes
- Open or short in EVAP heater wiring
- Failed EVAP heater element (heater coil burned/open)
- Poor or corroded connector or terminal at the heater or ECU
- Blown fuse or failed relay supplying the heater circuit
- ECM/PCM driver fault or internal control module error
- Intermittent wiring damage (chafing, water intrusion)
Symptoms
- Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
- Stored P1250 code (may be accompanied by other EVAP codes)
- Possible poor cold start behavior or drivability complaints in rare cases
- Failed emissions test or elevated evaporative emissions
- Occasional fuel odor near EVAP canister area if purge operation affected
What to check
- Use a scan tool to read DTC, freeze frame data and EVAP heater commanded status
- Visually inspect wiring, connectors, and the heater element for damage or corrosion
- Check related fuses and relays for continuity and correct operation
- Backprobe the heater connector and monitor voltage/ground while commanding the heater ON/OFF with a scan tool
- Measure heater element resistance with multimeter at the connector (with power removed)
- Wiggle test wiring while monitoring circuit voltage or resistance for intermittent faults
Signal parameters
- Control signal: ECM commands ON/OFF (digital output) when EVAP heater is requested
- Expected supply voltage at heater connector: approximately battery voltage when commanded ON (typical 9–14 V)
- Heater element resistance: typically low (a few ohms); should not be open — exact value varies by model
- Current draw: moderate when energized; excessive current suggests short, very high/zero current suggests open circuit or open heater
Diagnostic algorithm
- Connect a scan tool, confirm P1250 and note freeze frame data; attempt to reproduce the fault
- Visually inspect EVAP heater, harness, connectors, fuses, and any associated relays for obvious damage or corrosion
- With ignition off, disconnect heater connector and measure resistance of the heater element to ground and between terminals — compare to service values or verify it is not open
- Check fuse(s) and relay feeding the heater circuit; replace if blown or faulty
- Reconnect and backprobe heater connector. With scan tool commanding heater ON, verify supply voltage and ground presence at the connector; no voltage indicates open feed or relay/fuse fault
- If voltage present but heater not drawing current, suspect open heater element or poor ground; bench-test the heater by applying fused 12 V briefly and observe function/resistance
- Inspect and repair any damaged wiring, connectors, or grounds found. If wiring and connector are good but heater still fails, replace heater element
- If wiring and heater test good, but ECM output does not switch or shows abnormal behavior, test or replace the relay or investigate ECM driver circuit; consult manufacturer procedures before replacing ECM
- Clear codes, perform readiness/functional test, and road-test to confirm code does not return
Likely causes
- Damaged or disconnected harness to EVAP heater
- Corroded or loose connector at the heater or ground
- Failed heater element (measured open or out-of-spec resistance)
- Blown inline fuse or failed relay in the heater supply
- Short to battery or ground caused by insulation failure
- Faulty ECM output stage (less common)
Fault status
Status
Electrical fault detected in the Early Fuel Evaporation (EVAP) Heater circuit. Possible open, short, high resistance, or control driver failure preventing proper heater operation.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1250
GMC
P — Powertrain
Early Fuel Evaporation Heater Circuit
Views:
UK: 26
EN: 36
RU: 26
AI status
Completed
Completed
100%
Causes
- Open or short in EVAP heater wiring
- Failed EVAP heater element (heater coil burned/open)
- Poor or corroded connector or terminal at the heater or ECU
- Blown fuse or failed relay supplying the heater circuit
- ECM/PCM driver fault or internal control module error
- Intermittent wiring damage (chafing, water intrusion)
Symptoms
- Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
- Stored P1250 code (may be accompanied by other EVAP codes)
- Possible poor cold start behavior or drivability complaints in rare cases
- Failed emissions test or elevated evaporative emissions
- Occasional fuel odor near EVAP canister area if purge operation affected
What to check
- Use a scan tool to read DTC, freeze frame data and EVAP heater commanded status
- Visually inspect wiring, connectors, and the heater element for damage or corrosion
- Check related fuses and relays for continuity and correct operation
- Backprobe the heater connector and monitor voltage/ground while commanding the heater ON/OFF with a scan tool
- Measure heater element resistance with multimeter at the connector (with power removed)
- Wiggle test wiring while monitoring circuit voltage or resistance for intermittent faults
Signal parameters
- Control signal: ECM commands ON/OFF (digital output) when EVAP heater is requested
- Expected supply voltage at heater connector: approximately battery voltage when commanded ON (typical 9–14 V)
- Heater element resistance: typically low (a few ohms); should not be open — exact value varies by model
- Current draw: moderate when energized; excessive current suggests short, very high/zero current suggests open circuit or open heater
Diagnostic algorithm
- Connect a scan tool, confirm P1250 and note freeze frame data; attempt to reproduce the fault
- Visually inspect EVAP heater, harness, connectors, fuses, and any associated relays for obvious damage or corrosion
- With ignition off, disconnect heater connector and measure resistance of the heater element to ground and between terminals — compare to service values or verify it is not open
- Check fuse(s) and relay feeding the heater circuit; replace if blown or faulty
- Reconnect and backprobe heater connector. With scan tool commanding heater ON, verify supply voltage and ground presence at the connector; no voltage indicates open feed or relay/fuse fault
- If voltage present but heater not drawing current, suspect open heater element or poor ground; bench-test the heater by applying fused 12 V briefly and observe function/resistance
- Inspect and repair any damaged wiring, connectors, or grounds found. If wiring and connector are good but heater still fails, replace heater element
- If wiring and heater test good, but ECM output does not switch or shows abnormal behavior, test or replace the relay or investigate ECM driver circuit; consult manufacturer procedures before replacing ECM
- Clear codes, perform readiness/functional test, and road-test to confirm code does not return
Likely causes
- Damaged or disconnected harness to EVAP heater
- Corroded or loose connector at the heater or ground
- Failed heater element (measured open or out-of-spec resistance)
- Blown inline fuse or failed relay in the heater supply
- Short to battery or ground caused by insulation failure
- Faulty ECM output stage (less common)
Fault status
Status
Electrical fault detected in the Early Fuel Evaporation (EVAP) Heater circuit. Possible open, short, high resistance, or control driver failure preventing proper heater operation.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1250
HUMMER
P — Powertrain
Early Fuel Evaporation Heater Circuit
Views:
UK: 9
EN: 14
RU: 13
AI status
Completed
Completed
100%
Causes
- Open or short in EVAP heater wiring
- Failed EVAP heater element (heater coil burned/open)
- Poor or corroded connector or terminal at the heater or ECU
- Blown fuse or failed relay supplying the heater circuit
- ECM/PCM driver fault or internal control module error
- Intermittent wiring damage (chafing, water intrusion)
Symptoms
- Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
- Stored P1250 code (may be accompanied by other EVAP codes)
- Possible poor cold start behavior or drivability complaints in rare cases
- Failed emissions test or elevated evaporative emissions
- Occasional fuel odor near EVAP canister area if purge operation affected
What to check
- Use a scan tool to read DTC, freeze frame data and EVAP heater commanded status
- Visually inspect wiring, connectors, and the heater element for damage or corrosion
- Check related fuses and relays for continuity and correct operation
- Backprobe the heater connector and monitor voltage/ground while commanding the heater ON/OFF with a scan tool
- Measure heater element resistance with multimeter at the connector (with power removed)
- Wiggle test wiring while monitoring circuit voltage or resistance for intermittent faults
Signal parameters
- Control signal: ECM commands ON/OFF (digital output) when EVAP heater is requested
- Expected supply voltage at heater connector: approximately battery voltage when commanded ON (typical 9–14 V)
- Heater element resistance: typically low (a few ohms); should not be open — exact value varies by model
- Current draw: moderate when energized; excessive current suggests short, very high/zero current suggests open circuit or open heater
Diagnostic algorithm
- Connect a scan tool, confirm P1250 and note freeze frame data; attempt to reproduce the fault
- Visually inspect EVAP heater, harness, connectors, fuses, and any associated relays for obvious damage or corrosion
- With ignition off, disconnect heater connector and measure resistance of the heater element to ground and between terminals — compare to service values or verify it is not open
- Check fuse(s) and relay feeding the heater circuit; replace if blown or faulty
- Reconnect and backprobe heater connector. With scan tool commanding heater ON, verify supply voltage and ground presence at the connector; no voltage indicates open feed or relay/fuse fault
- If voltage present but heater not drawing current, suspect open heater element or poor ground; bench-test the heater by applying fused 12 V briefly and observe function/resistance
- Inspect and repair any damaged wiring, connectors, or grounds found. If wiring and connector are good but heater still fails, replace heater element
- If wiring and heater test good, but ECM output does not switch or shows abnormal behavior, test or replace the relay or investigate ECM driver circuit; consult manufacturer procedures before replacing ECM
- Clear codes, perform readiness/functional test, and road-test to confirm code does not return
Likely causes
- Damaged or disconnected harness to EVAP heater
- Corroded or loose connector at the heater or ground
- Failed heater element (measured open or out-of-spec resistance)
- Blown inline fuse or failed relay in the heater supply
- Short to battery or ground caused by insulation failure
- Faulty ECM output stage (less common)
Fault status
Status
Electrical fault detected in the Early Fuel Evaporation (EVAP) Heater circuit. Possible open, short, high resistance, or control driver failure preventing proper heater operation.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1250
JAGUAR
P — Powertrain
Throttle Valve Spring
Views:
UK: 25
EN: 35
RU: 24
AI status
Completed
Completed
100%
Causes
- Open or short in EVAP heater wiring
- Failed EVAP heater element (heater coil burned/open)
- Poor or corroded connector or terminal at the heater or ECU
- Blown fuse or failed relay supplying the heater circuit
- ECM/PCM driver fault or internal control module error
- Intermittent wiring damage (chafing, water intrusion)
Symptoms
- Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
- Stored P1250 code (may be accompanied by other EVAP codes)
- Possible poor cold start behavior or drivability complaints in rare cases
- Failed emissions test or elevated evaporative emissions
- Occasional fuel odor near EVAP canister area if purge operation affected
What to check
- Use a scan tool to read DTC, freeze frame data and EVAP heater commanded status
- Visually inspect wiring, connectors, and the heater element for damage or corrosion
- Check related fuses and relays for continuity and correct operation
- Backprobe the heater connector and monitor voltage/ground while commanding the heater ON/OFF with a scan tool
- Measure heater element resistance with multimeter at the connector (with power removed)
- Wiggle test wiring while monitoring circuit voltage or resistance for intermittent faults
Signal parameters
- Control signal: ECM commands ON/OFF (digital output) when EVAP heater is requested
- Expected supply voltage at heater connector: approximately battery voltage when commanded ON (typical 9–14 V)
- Heater element resistance: typically low (a few ohms); should not be open — exact value varies by model
- Current draw: moderate when energized; excessive current suggests short, very high/zero current suggests open circuit or open heater
Diagnostic algorithm
- Connect a scan tool, confirm P1250 and note freeze frame data; attempt to reproduce the fault
- Visually inspect EVAP heater, harness, connectors, fuses, and any associated relays for obvious damage or corrosion
- With ignition off, disconnect heater connector and measure resistance of the heater element to ground and between terminals — compare to service values or verify it is not open
- Check fuse(s) and relay feeding the heater circuit; replace if blown or faulty
- Reconnect and backprobe heater connector. With scan tool commanding heater ON, verify supply voltage and ground presence at the connector; no voltage indicates open feed or relay/fuse fault
- If voltage present but heater not drawing current, suspect open heater element or poor ground; bench-test the heater by applying fused 12 V briefly and observe function/resistance
- Inspect and repair any damaged wiring, connectors, or grounds found. If wiring and connector are good but heater still fails, replace heater element
- If wiring and heater test good, but ECM output does not switch or shows abnormal behavior, test or replace the relay or investigate ECM driver circuit; consult manufacturer procedures before replacing ECM
- Clear codes, perform readiness/functional test, and road-test to confirm code does not return
Likely causes
- Damaged or disconnected harness to EVAP heater
- Corroded or loose connector at the heater or ground
- Failed heater element (measured open or out-of-spec resistance)
- Blown inline fuse or failed relay in the heater supply
- Short to battery or ground caused by insulation failure
- Faulty ECM output stage (less common)
Fault status
Status
Electrical fault detected in the Early Fuel Evaporation (EVAP) Heater circuit. Possible open, short, high resistance, or control driver failure preventing proper heater operation.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1250
KIA
P — Powertrain
Pressure Regulator Control Solenoid Valve Open Or Short
Views:
UK: 27
EN: 34
RU: 24
AI status
Completed
Completed
100%
Causes
- Open or short in EVAP heater wiring
- Failed EVAP heater element (heater coil burned/open)
- Poor or corroded connector or terminal at the heater or ECU
- Blown fuse or failed relay supplying the heater circuit
- ECM/PCM driver fault or internal control module error
- Intermittent wiring damage (chafing, water intrusion)
Symptoms
- Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
- Stored P1250 code (may be accompanied by other EVAP codes)
- Possible poor cold start behavior or drivability complaints in rare cases
- Failed emissions test or elevated evaporative emissions
- Occasional fuel odor near EVAP canister area if purge operation affected
What to check
- Use a scan tool to read DTC, freeze frame data and EVAP heater commanded status
- Visually inspect wiring, connectors, and the heater element for damage or corrosion
- Check related fuses and relays for continuity and correct operation
- Backprobe the heater connector and monitor voltage/ground while commanding the heater ON/OFF with a scan tool
- Measure heater element resistance with multimeter at the connector (with power removed)
- Wiggle test wiring while monitoring circuit voltage or resistance for intermittent faults
Signal parameters
- Control signal: ECM commands ON/OFF (digital output) when EVAP heater is requested
- Expected supply voltage at heater connector: approximately battery voltage when commanded ON (typical 9–14 V)
- Heater element resistance: typically low (a few ohms); should not be open — exact value varies by model
- Current draw: moderate when energized; excessive current suggests short, very high/zero current suggests open circuit or open heater
Diagnostic algorithm
- Connect a scan tool, confirm P1250 and note freeze frame data; attempt to reproduce the fault
- Visually inspect EVAP heater, harness, connectors, fuses, and any associated relays for obvious damage or corrosion
- With ignition off, disconnect heater connector and measure resistance of the heater element to ground and between terminals — compare to service values or verify it is not open
- Check fuse(s) and relay feeding the heater circuit; replace if blown or faulty
- Reconnect and backprobe heater connector. With scan tool commanding heater ON, verify supply voltage and ground presence at the connector; no voltage indicates open feed or relay/fuse fault
- If voltage present but heater not drawing current, suspect open heater element or poor ground; bench-test the heater by applying fused 12 V briefly and observe function/resistance
- Inspect and repair any damaged wiring, connectors, or grounds found. If wiring and connector are good but heater still fails, replace heater element
- If wiring and heater test good, but ECM output does not switch or shows abnormal behavior, test or replace the relay or investigate ECM driver circuit; consult manufacturer procedures before replacing ECM
- Clear codes, perform readiness/functional test, and road-test to confirm code does not return
Likely causes
- Damaged or disconnected harness to EVAP heater
- Corroded or loose connector at the heater or ground
- Failed heater element (measured open or out-of-spec resistance)
- Blown inline fuse or failed relay in the heater supply
- Short to battery or ground caused by insulation failure
- Faulty ECM output stage (less common)
Fault status
Status
Electrical fault detected in the Early Fuel Evaporation (EVAP) Heater circuit. Possible open, short, high resistance, or control driver failure preventing proper heater operation.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1250
LAND ROVER
P — Powertrain
Malfunction of the throttle valve spring
Views:
UK: 6
EN: 12
RU: 9
AI status
Completed
Completed
100%
Causes
- Open or short in EVAP heater wiring
- Failed EVAP heater element (heater coil burned/open)
- Poor or corroded connector or terminal at the heater or ECU
- Blown fuse or failed relay supplying the heater circuit
- ECM/PCM driver fault or internal control module error
- Intermittent wiring damage (chafing, water intrusion)
Symptoms
- Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
- Stored P1250 code (may be accompanied by other EVAP codes)
- Possible poor cold start behavior or drivability complaints in rare cases
- Failed emissions test or elevated evaporative emissions
- Occasional fuel odor near EVAP canister area if purge operation affected
What to check
- Use a scan tool to read DTC, freeze frame data and EVAP heater commanded status
- Visually inspect wiring, connectors, and the heater element for damage or corrosion
- Check related fuses and relays for continuity and correct operation
- Backprobe the heater connector and monitor voltage/ground while commanding the heater ON/OFF with a scan tool
- Measure heater element resistance with multimeter at the connector (with power removed)
- Wiggle test wiring while monitoring circuit voltage or resistance for intermittent faults
Signal parameters
- Control signal: ECM commands ON/OFF (digital output) when EVAP heater is requested
- Expected supply voltage at heater connector: approximately battery voltage when commanded ON (typical 9–14 V)
- Heater element resistance: typically low (a few ohms); should not be open — exact value varies by model
- Current draw: moderate when energized; excessive current suggests short, very high/zero current suggests open circuit or open heater
Diagnostic algorithm
- Connect a scan tool, confirm P1250 and note freeze frame data; attempt to reproduce the fault
- Visually inspect EVAP heater, harness, connectors, fuses, and any associated relays for obvious damage or corrosion
- With ignition off, disconnect heater connector and measure resistance of the heater element to ground and between terminals — compare to service values or verify it is not open
- Check fuse(s) and relay feeding the heater circuit; replace if blown or faulty
- Reconnect and backprobe heater connector. With scan tool commanding heater ON, verify supply voltage and ground presence at the connector; no voltage indicates open feed or relay/fuse fault
- If voltage present but heater not drawing current, suspect open heater element or poor ground; bench-test the heater by applying fused 12 V briefly and observe function/resistance
- Inspect and repair any damaged wiring, connectors, or grounds found. If wiring and connector are good but heater still fails, replace heater element
- If wiring and heater test good, but ECM output does not switch or shows abnormal behavior, test or replace the relay or investigate ECM driver circuit; consult manufacturer procedures before replacing ECM
- Clear codes, perform readiness/functional test, and road-test to confirm code does not return
Likely causes
- Damaged or disconnected harness to EVAP heater
- Corroded or loose connector at the heater or ground
- Failed heater element (measured open or out-of-spec resistance)
- Blown inline fuse or failed relay in the heater supply
- Short to battery or ground caused by insulation failure
- Faulty ECM output stage (less common)
Fault status
Status
Electrical fault detected in the Early Fuel Evaporation (EVAP) Heater circuit. Possible open, short, high resistance, or control driver failure preventing proper heater operation.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1250
LINCOLN
P — Powertrain
Lack of Power to FPRC Solenoid
Views:
UK: 27
EN: 40
RU: 25
AI status
Completed
Completed
100%
Causes
- Open or short in EVAP heater wiring
- Failed EVAP heater element (heater coil burned/open)
- Poor or corroded connector or terminal at the heater or ECU
- Blown fuse or failed relay supplying the heater circuit
- ECM/PCM driver fault or internal control module error
- Intermittent wiring damage (chafing, water intrusion)
Symptoms
- Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
- Stored P1250 code (may be accompanied by other EVAP codes)
- Possible poor cold start behavior or drivability complaints in rare cases
- Failed emissions test or elevated evaporative emissions
- Occasional fuel odor near EVAP canister area if purge operation affected
What to check
- Use a scan tool to read DTC, freeze frame data and EVAP heater commanded status
- Visually inspect wiring, connectors, and the heater element for damage or corrosion
- Check related fuses and relays for continuity and correct operation
- Backprobe the heater connector and monitor voltage/ground while commanding the heater ON/OFF with a scan tool
- Measure heater element resistance with multimeter at the connector (with power removed)
- Wiggle test wiring while monitoring circuit voltage or resistance for intermittent faults
Signal parameters
- Control signal: ECM commands ON/OFF (digital output) when EVAP heater is requested
- Expected supply voltage at heater connector: approximately battery voltage when commanded ON (typical 9–14 V)
- Heater element resistance: typically low (a few ohms); should not be open — exact value varies by model
- Current draw: moderate when energized; excessive current suggests short, very high/zero current suggests open circuit or open heater
Diagnostic algorithm
- Connect a scan tool, confirm P1250 and note freeze frame data; attempt to reproduce the fault
- Visually inspect EVAP heater, harness, connectors, fuses, and any associated relays for obvious damage or corrosion
- With ignition off, disconnect heater connector and measure resistance of the heater element to ground and between terminals — compare to service values or verify it is not open
- Check fuse(s) and relay feeding the heater circuit; replace if blown or faulty
- Reconnect and backprobe heater connector. With scan tool commanding heater ON, verify supply voltage and ground presence at the connector; no voltage indicates open feed or relay/fuse fault
- If voltage present but heater not drawing current, suspect open heater element or poor ground; bench-test the heater by applying fused 12 V briefly and observe function/resistance
- Inspect and repair any damaged wiring, connectors, or grounds found. If wiring and connector are good but heater still fails, replace heater element
- If wiring and heater test good, but ECM output does not switch or shows abnormal behavior, test or replace the relay or investigate ECM driver circuit; consult manufacturer procedures before replacing ECM
- Clear codes, perform readiness/functional test, and road-test to confirm code does not return
Likely causes
- Damaged or disconnected harness to EVAP heater
- Corroded or loose connector at the heater or ground
- Failed heater element (measured open or out-of-spec resistance)
- Blown inline fuse or failed relay in the heater supply
- Short to battery or ground caused by insulation failure
- Faulty ECM output stage (less common)
Fault status
Status
Electrical fault detected in the Early Fuel Evaporation (EVAP) Heater circuit. Possible open, short, high resistance, or control driver failure preventing proper heater operation.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1250
MAZDA
P — Powertrain
Pressure Regulator Control Solenoid Circuit
Views:
UK: 25
EN: 44
RU: 23
AI status
Completed
Completed
100%
Causes
- Open or short in EVAP heater wiring
- Failed EVAP heater element (heater coil burned/open)
- Poor or corroded connector or terminal at the heater or ECU
- Blown fuse or failed relay supplying the heater circuit
- ECM/PCM driver fault or internal control module error
- Intermittent wiring damage (chafing, water intrusion)
Symptoms
- Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
- Stored P1250 code (may be accompanied by other EVAP codes)
- Possible poor cold start behavior or drivability complaints in rare cases
- Failed emissions test or elevated evaporative emissions
- Occasional fuel odor near EVAP canister area if purge operation affected
What to check
- Use a scan tool to read DTC, freeze frame data and EVAP heater commanded status
- Visually inspect wiring, connectors, and the heater element for damage or corrosion
- Check related fuses and relays for continuity and correct operation
- Backprobe the heater connector and monitor voltage/ground while commanding the heater ON/OFF with a scan tool
- Measure heater element resistance with multimeter at the connector (with power removed)
- Wiggle test wiring while monitoring circuit voltage or resistance for intermittent faults
Signal parameters
- Control signal: ECM commands ON/OFF (digital output) when EVAP heater is requested
- Expected supply voltage at heater connector: approximately battery voltage when commanded ON (typical 9–14 V)
- Heater element resistance: typically low (a few ohms); should not be open — exact value varies by model
- Current draw: moderate when energized; excessive current suggests short, very high/zero current suggests open circuit or open heater
Diagnostic algorithm
- Connect a scan tool, confirm P1250 and note freeze frame data; attempt to reproduce the fault
- Visually inspect EVAP heater, harness, connectors, fuses, and any associated relays for obvious damage or corrosion
- With ignition off, disconnect heater connector and measure resistance of the heater element to ground and between terminals — compare to service values or verify it is not open
- Check fuse(s) and relay feeding the heater circuit; replace if blown or faulty
- Reconnect and backprobe heater connector. With scan tool commanding heater ON, verify supply voltage and ground presence at the connector; no voltage indicates open feed or relay/fuse fault
- If voltage present but heater not drawing current, suspect open heater element or poor ground; bench-test the heater by applying fused 12 V briefly and observe function/resistance
- Inspect and repair any damaged wiring, connectors, or grounds found. If wiring and connector are good but heater still fails, replace heater element
- If wiring and heater test good, but ECM output does not switch or shows abnormal behavior, test or replace the relay or investigate ECM driver circuit; consult manufacturer procedures before replacing ECM
- Clear codes, perform readiness/functional test, and road-test to confirm code does not return
Likely causes
- Damaged or disconnected harness to EVAP heater
- Corroded or loose connector at the heater or ground
- Failed heater element (measured open or out-of-spec resistance)
- Blown inline fuse or failed relay in the heater supply
- Short to battery or ground caused by insulation failure
- Faulty ECM output stage (less common)
Fault status
Status
Electrical fault detected in the Early Fuel Evaporation (EVAP) Heater circuit. Possible open, short, high resistance, or control driver failure preventing proper heater operation.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1250
MERCURY
P — Powertrain
Lack of Power to FPRC Solenoid
Views:
UK: 26
EN: 44
RU: 26
AI status
Completed
Completed
100%
Causes
- Open or short in EVAP heater wiring
- Failed EVAP heater element (heater coil burned/open)
- Poor or corroded connector or terminal at the heater or ECU
- Blown fuse or failed relay supplying the heater circuit
- ECM/PCM driver fault or internal control module error
- Intermittent wiring damage (chafing, water intrusion)
Symptoms
- Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
- Stored P1250 code (may be accompanied by other EVAP codes)
- Possible poor cold start behavior or drivability complaints in rare cases
- Failed emissions test or elevated evaporative emissions
- Occasional fuel odor near EVAP canister area if purge operation affected
What to check
- Use a scan tool to read DTC, freeze frame data and EVAP heater commanded status
- Visually inspect wiring, connectors, and the heater element for damage or corrosion
- Check related fuses and relays for continuity and correct operation
- Backprobe the heater connector and monitor voltage/ground while commanding the heater ON/OFF with a scan tool
- Measure heater element resistance with multimeter at the connector (with power removed)
- Wiggle test wiring while monitoring circuit voltage or resistance for intermittent faults
Signal parameters
- Control signal: ECM commands ON/OFF (digital output) when EVAP heater is requested
- Expected supply voltage at heater connector: approximately battery voltage when commanded ON (typical 9–14 V)
- Heater element resistance: typically low (a few ohms); should not be open — exact value varies by model
- Current draw: moderate when energized; excessive current suggests short, very high/zero current suggests open circuit or open heater
Diagnostic algorithm
- Connect a scan tool, confirm P1250 and note freeze frame data; attempt to reproduce the fault
- Visually inspect EVAP heater, harness, connectors, fuses, and any associated relays for obvious damage or corrosion
- With ignition off, disconnect heater connector and measure resistance of the heater element to ground and between terminals — compare to service values or verify it is not open
- Check fuse(s) and relay feeding the heater circuit; replace if blown or faulty
- Reconnect and backprobe heater connector. With scan tool commanding heater ON, verify supply voltage and ground presence at the connector; no voltage indicates open feed or relay/fuse fault
- If voltage present but heater not drawing current, suspect open heater element or poor ground; bench-test the heater by applying fused 12 V briefly and observe function/resistance
- Inspect and repair any damaged wiring, connectors, or grounds found. If wiring and connector are good but heater still fails, replace heater element
- If wiring and heater test good, but ECM output does not switch or shows abnormal behavior, test or replace the relay or investigate ECM driver circuit; consult manufacturer procedures before replacing ECM
- Clear codes, perform readiness/functional test, and road-test to confirm code does not return
Likely causes
- Damaged or disconnected harness to EVAP heater
- Corroded or loose connector at the heater or ground
- Failed heater element (measured open or out-of-spec resistance)
- Blown inline fuse or failed relay in the heater supply
- Short to battery or ground caused by insulation failure
- Faulty ECM output stage (less common)
Fault status
Status
Electrical fault detected in the Early Fuel Evaporation (EVAP) Heater circuit. Possible open, short, high resistance, or control driver failure preventing proper heater operation.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1250
OLDSMOBILE
P — Powertrain
Early Fuel Evaporation Heater Circuit
Views:
UK: 30
EN: 37
RU: 28
AI status
Completed
Completed
100%
Causes
- Open or short in EVAP heater wiring
- Failed EVAP heater element (heater coil burned/open)
- Poor or corroded connector or terminal at the heater or ECU
- Blown fuse or failed relay supplying the heater circuit
- ECM/PCM driver fault or internal control module error
- Intermittent wiring damage (chafing, water intrusion)
Symptoms
- Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
- Stored P1250 code (may be accompanied by other EVAP codes)
- Possible poor cold start behavior or drivability complaints in rare cases
- Failed emissions test or elevated evaporative emissions
- Occasional fuel odor near EVAP canister area if purge operation affected
What to check
- Use a scan tool to read DTC, freeze frame data and EVAP heater commanded status
- Visually inspect wiring, connectors, and the heater element for damage or corrosion
- Check related fuses and relays for continuity and correct operation
- Backprobe the heater connector and monitor voltage/ground while commanding the heater ON/OFF with a scan tool
- Measure heater element resistance with multimeter at the connector (with power removed)
- Wiggle test wiring while monitoring circuit voltage or resistance for intermittent faults
Signal parameters
- Control signal: ECM commands ON/OFF (digital output) when EVAP heater is requested
- Expected supply voltage at heater connector: approximately battery voltage when commanded ON (typical 9–14 V)
- Heater element resistance: typically low (a few ohms); should not be open — exact value varies by model
- Current draw: moderate when energized; excessive current suggests short, very high/zero current suggests open circuit or open heater
Diagnostic algorithm
- Connect a scan tool, confirm P1250 and note freeze frame data; attempt to reproduce the fault
- Visually inspect EVAP heater, harness, connectors, fuses, and any associated relays for obvious damage or corrosion
- With ignition off, disconnect heater connector and measure resistance of the heater element to ground and between terminals — compare to service values or verify it is not open
- Check fuse(s) and relay feeding the heater circuit; replace if blown or faulty
- Reconnect and backprobe heater connector. With scan tool commanding heater ON, verify supply voltage and ground presence at the connector; no voltage indicates open feed or relay/fuse fault
- If voltage present but heater not drawing current, suspect open heater element or poor ground; bench-test the heater by applying fused 12 V briefly and observe function/resistance
- Inspect and repair any damaged wiring, connectors, or grounds found. If wiring and connector are good but heater still fails, replace heater element
- If wiring and heater test good, but ECM output does not switch or shows abnormal behavior, test or replace the relay or investigate ECM driver circuit; consult manufacturer procedures before replacing ECM
- Clear codes, perform readiness/functional test, and road-test to confirm code does not return
Likely causes
- Damaged or disconnected harness to EVAP heater
- Corroded or loose connector at the heater or ground
- Failed heater element (measured open or out-of-spec resistance)
- Blown inline fuse or failed relay in the heater supply
- Short to battery or ground caused by insulation failure
- Faulty ECM output stage (less common)
Fault status
Status
Electrical fault detected in the Early Fuel Evaporation (EVAP) Heater circuit. Possible open, short, high resistance, or control driver failure preventing proper heater operation.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1250
Other
P — Powertrain
PRC Solenoid Circuit Malfunction
Views:
UK: 28
EN: 40
RU: 30
AI status
Completed
Completed
100%
Causes
- Open or short in EVAP heater wiring
- Failed EVAP heater element (heater coil burned/open)
- Poor or corroded connector or terminal at the heater or ECU
- Blown fuse or failed relay supplying the heater circuit
- ECM/PCM driver fault or internal control module error
- Intermittent wiring damage (chafing, water intrusion)
Symptoms
- Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
- Stored P1250 code (may be accompanied by other EVAP codes)
- Possible poor cold start behavior or drivability complaints in rare cases
- Failed emissions test or elevated evaporative emissions
- Occasional fuel odor near EVAP canister area if purge operation affected
What to check
- Use a scan tool to read DTC, freeze frame data and EVAP heater commanded status
- Visually inspect wiring, connectors, and the heater element for damage or corrosion
- Check related fuses and relays for continuity and correct operation
- Backprobe the heater connector and monitor voltage/ground while commanding the heater ON/OFF with a scan tool
- Measure heater element resistance with multimeter at the connector (with power removed)
- Wiggle test wiring while monitoring circuit voltage or resistance for intermittent faults
Signal parameters
- Control signal: ECM commands ON/OFF (digital output) when EVAP heater is requested
- Expected supply voltage at heater connector: approximately battery voltage when commanded ON (typical 9–14 V)
- Heater element resistance: typically low (a few ohms); should not be open — exact value varies by model
- Current draw: moderate when energized; excessive current suggests short, very high/zero current suggests open circuit or open heater
Diagnostic algorithm
- Connect a scan tool, confirm P1250 and note freeze frame data; attempt to reproduce the fault
- Visually inspect EVAP heater, harness, connectors, fuses, and any associated relays for obvious damage or corrosion
- With ignition off, disconnect heater connector and measure resistance of the heater element to ground and between terminals — compare to service values or verify it is not open
- Check fuse(s) and relay feeding the heater circuit; replace if blown or faulty
- Reconnect and backprobe heater connector. With scan tool commanding heater ON, verify supply voltage and ground presence at the connector; no voltage indicates open feed or relay/fuse fault
- If voltage present but heater not drawing current, suspect open heater element or poor ground; bench-test the heater by applying fused 12 V briefly and observe function/resistance
- Inspect and repair any damaged wiring, connectors, or grounds found. If wiring and connector are good but heater still fails, replace heater element
- If wiring and heater test good, but ECM output does not switch or shows abnormal behavior, test or replace the relay or investigate ECM driver circuit; consult manufacturer procedures before replacing ECM
- Clear codes, perform readiness/functional test, and road-test to confirm code does not return
Likely causes
- Damaged or disconnected harness to EVAP heater
- Corroded or loose connector at the heater or ground
- Failed heater element (measured open or out-of-spec resistance)
- Blown inline fuse or failed relay in the heater supply
- Short to battery or ground caused by insulation failure
- Faulty ECM output stage (less common)
Fault status
Status
Electrical fault detected in the Early Fuel Evaporation (EVAP) Heater circuit. Possible open, short, high resistance, or control driver failure preventing proper heater operation.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1250
RAM
P — Powertrain
Vacuum Reservoir Control Circuit Open
Views:
UK: 1
EN: 2
RU: 1
AI status
Completed
Completed
100%
Causes
- Open or short in EVAP heater wiring
- Failed EVAP heater element (heater coil burned/open)
- Poor or corroded connector or terminal at the heater or ECU
- Blown fuse or failed relay supplying the heater circuit
- ECM/PCM driver fault or internal control module error
- Intermittent wiring damage (chafing, water intrusion)
Symptoms
- Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
- Stored P1250 code (may be accompanied by other EVAP codes)
- Possible poor cold start behavior or drivability complaints in rare cases
- Failed emissions test or elevated evaporative emissions
- Occasional fuel odor near EVAP canister area if purge operation affected
What to check
- Use a scan tool to read DTC, freeze frame data and EVAP heater commanded status
- Visually inspect wiring, connectors, and the heater element for damage or corrosion
- Check related fuses and relays for continuity and correct operation
- Backprobe the heater connector and monitor voltage/ground while commanding the heater ON/OFF with a scan tool
- Measure heater element resistance with multimeter at the connector (with power removed)
- Wiggle test wiring while monitoring circuit voltage or resistance for intermittent faults
Signal parameters
- Control signal: ECM commands ON/OFF (digital output) when EVAP heater is requested
- Expected supply voltage at heater connector: approximately battery voltage when commanded ON (typical 9–14 V)
- Heater element resistance: typically low (a few ohms); should not be open — exact value varies by model
- Current draw: moderate when energized; excessive current suggests short, very high/zero current suggests open circuit or open heater
Diagnostic algorithm
- Connect a scan tool, confirm P1250 and note freeze frame data; attempt to reproduce the fault
- Visually inspect EVAP heater, harness, connectors, fuses, and any associated relays for obvious damage or corrosion
- With ignition off, disconnect heater connector and measure resistance of the heater element to ground and between terminals — compare to service values or verify it is not open
- Check fuse(s) and relay feeding the heater circuit; replace if blown or faulty
- Reconnect and backprobe heater connector. With scan tool commanding heater ON, verify supply voltage and ground presence at the connector; no voltage indicates open feed or relay/fuse fault
- If voltage present but heater not drawing current, suspect open heater element or poor ground; bench-test the heater by applying fused 12 V briefly and observe function/resistance
- Inspect and repair any damaged wiring, connectors, or grounds found. If wiring and connector are good but heater still fails, replace heater element
- If wiring and heater test good, but ECM output does not switch or shows abnormal behavior, test or replace the relay or investigate ECM driver circuit; consult manufacturer procedures before replacing ECM
- Clear codes, perform readiness/functional test, and road-test to confirm code does not return
Likely causes
- Damaged or disconnected harness to EVAP heater
- Corroded or loose connector at the heater or ground
- Failed heater element (measured open or out-of-spec resistance)
- Blown inline fuse or failed relay in the heater supply
- Short to battery or ground caused by insulation failure
- Faulty ECM output stage (less common)
Fault status
Status
Electrical fault detected in the Early Fuel Evaporation (EVAP) Heater circuit. Possible open, short, high resistance, or control driver failure preventing proper heater operation.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1250
SATURN
P — Powertrain
Early Fuel Evaporation Heater Circuit
Views:
UK: 27
EN: 37
RU: 24
AI status
Completed
Completed
100%
Causes
- Open or short in EVAP heater wiring
- Failed EVAP heater element (heater coil burned/open)
- Poor or corroded connector or terminal at the heater or ECU
- Blown fuse or failed relay supplying the heater circuit
- ECM/PCM driver fault or internal control module error
- Intermittent wiring damage (chafing, water intrusion)
Symptoms
- Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
- Stored P1250 code (may be accompanied by other EVAP codes)
- Possible poor cold start behavior or drivability complaints in rare cases
- Failed emissions test or elevated evaporative emissions
- Occasional fuel odor near EVAP canister area if purge operation affected
What to check
- Use a scan tool to read DTC, freeze frame data and EVAP heater commanded status
- Visually inspect wiring, connectors, and the heater element for damage or corrosion
- Check related fuses and relays for continuity and correct operation
- Backprobe the heater connector and monitor voltage/ground while commanding the heater ON/OFF with a scan tool
- Measure heater element resistance with multimeter at the connector (with power removed)
- Wiggle test wiring while monitoring circuit voltage or resistance for intermittent faults
Signal parameters
- Control signal: ECM commands ON/OFF (digital output) when EVAP heater is requested
- Expected supply voltage at heater connector: approximately battery voltage when commanded ON (typical 9–14 V)
- Heater element resistance: typically low (a few ohms); should not be open — exact value varies by model
- Current draw: moderate when energized; excessive current suggests short, very high/zero current suggests open circuit or open heater
Diagnostic algorithm
- Connect a scan tool, confirm P1250 and note freeze frame data; attempt to reproduce the fault
- Visually inspect EVAP heater, harness, connectors, fuses, and any associated relays for obvious damage or corrosion
- With ignition off, disconnect heater connector and measure resistance of the heater element to ground and between terminals — compare to service values or verify it is not open
- Check fuse(s) and relay feeding the heater circuit; replace if blown or faulty
- Reconnect and backprobe heater connector. With scan tool commanding heater ON, verify supply voltage and ground presence at the connector; no voltage indicates open feed or relay/fuse fault
- If voltage present but heater not drawing current, suspect open heater element or poor ground; bench-test the heater by applying fused 12 V briefly and observe function/resistance
- Inspect and repair any damaged wiring, connectors, or grounds found. If wiring and connector are good but heater still fails, replace heater element
- If wiring and heater test good, but ECM output does not switch or shows abnormal behavior, test or replace the relay or investigate ECM driver circuit; consult manufacturer procedures before replacing ECM
- Clear codes, perform readiness/functional test, and road-test to confirm code does not return
Likely causes
- Damaged or disconnected harness to EVAP heater
- Corroded or loose connector at the heater or ground
- Failed heater element (measured open or out-of-spec resistance)
- Blown inline fuse or failed relay in the heater supply
- Short to battery or ground caused by insulation failure
- Faulty ECM output stage (less common)
Fault status
Status
Electrical fault detected in the Early Fuel Evaporation (EVAP) Heater circuit. Possible open, short, high resistance, or control driver failure preventing proper heater operation.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1250
SCION
P — Powertrain
Pressure regulator control valve malfunction
Views:
UK: 1
EN: 3
RU: 1
AI status
Completed
Completed
100%
Causes
- Open or short in EVAP heater wiring
- Failed EVAP heater element (heater coil burned/open)
- Poor or corroded connector or terminal at the heater or ECU
- Blown fuse or failed relay supplying the heater circuit
- ECM/PCM driver fault or internal control module error
- Intermittent wiring damage (chafing, water intrusion)
Symptoms
- Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
- Stored P1250 code (may be accompanied by other EVAP codes)
- Possible poor cold start behavior or drivability complaints in rare cases
- Failed emissions test or elevated evaporative emissions
- Occasional fuel odor near EVAP canister area if purge operation affected
What to check
- Use a scan tool to read DTC, freeze frame data and EVAP heater commanded status
- Visually inspect wiring, connectors, and the heater element for damage or corrosion
- Check related fuses and relays for continuity and correct operation
- Backprobe the heater connector and monitor voltage/ground while commanding the heater ON/OFF with a scan tool
- Measure heater element resistance with multimeter at the connector (with power removed)
- Wiggle test wiring while monitoring circuit voltage or resistance for intermittent faults
Signal parameters
- Control signal: ECM commands ON/OFF (digital output) when EVAP heater is requested
- Expected supply voltage at heater connector: approximately battery voltage when commanded ON (typical 9–14 V)
- Heater element resistance: typically low (a few ohms); should not be open — exact value varies by model
- Current draw: moderate when energized; excessive current suggests short, very high/zero current suggests open circuit or open heater
Diagnostic algorithm
- Connect a scan tool, confirm P1250 and note freeze frame data; attempt to reproduce the fault
- Visually inspect EVAP heater, harness, connectors, fuses, and any associated relays for obvious damage or corrosion
- With ignition off, disconnect heater connector and measure resistance of the heater element to ground and between terminals — compare to service values or verify it is not open
- Check fuse(s) and relay feeding the heater circuit; replace if blown or faulty
- Reconnect and backprobe heater connector. With scan tool commanding heater ON, verify supply voltage and ground presence at the connector; no voltage indicates open feed or relay/fuse fault
- If voltage present but heater not drawing current, suspect open heater element or poor ground; bench-test the heater by applying fused 12 V briefly and observe function/resistance
- Inspect and repair any damaged wiring, connectors, or grounds found. If wiring and connector are good but heater still fails, replace heater element
- If wiring and heater test good, but ECM output does not switch or shows abnormal behavior, test or replace the relay or investigate ECM driver circuit; consult manufacturer procedures before replacing ECM
- Clear codes, perform readiness/functional test, and road-test to confirm code does not return
Likely causes
- Damaged or disconnected harness to EVAP heater
- Corroded or loose connector at the heater or ground
- Failed heater element (measured open or out-of-spec resistance)
- Blown inline fuse or failed relay in the heater supply
- Short to battery or ground caused by insulation failure
- Faulty ECM output stage (less common)
Fault status
Status
Electrical fault detected in the Early Fuel Evaporation (EVAP) Heater circuit. Possible open, short, high resistance, or control driver failure preventing proper heater operation.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1250
SUZUKI
P — Powertrain
EFE Heater Circuit Fault
Views:
UK: 28
EN: 36
RU: 29
AI status
Completed
Completed
100%
Causes
- Open or short in EVAP heater wiring
- Failed EVAP heater element (heater coil burned/open)
- Poor or corroded connector or terminal at the heater or ECU
- Blown fuse or failed relay supplying the heater circuit
- ECM/PCM driver fault or internal control module error
- Intermittent wiring damage (chafing, water intrusion)
Symptoms
- Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
- Stored P1250 code (may be accompanied by other EVAP codes)
- Possible poor cold start behavior or drivability complaints in rare cases
- Failed emissions test or elevated evaporative emissions
- Occasional fuel odor near EVAP canister area if purge operation affected
What to check
- Use a scan tool to read DTC, freeze frame data and EVAP heater commanded status
- Visually inspect wiring, connectors, and the heater element for damage or corrosion
- Check related fuses and relays for continuity and correct operation
- Backprobe the heater connector and monitor voltage/ground while commanding the heater ON/OFF with a scan tool
- Measure heater element resistance with multimeter at the connector (with power removed)
- Wiggle test wiring while monitoring circuit voltage or resistance for intermittent faults
Signal parameters
- Control signal: ECM commands ON/OFF (digital output) when EVAP heater is requested
- Expected supply voltage at heater connector: approximately battery voltage when commanded ON (typical 9–14 V)
- Heater element resistance: typically low (a few ohms); should not be open — exact value varies by model
- Current draw: moderate when energized; excessive current suggests short, very high/zero current suggests open circuit or open heater
Diagnostic algorithm
- Connect a scan tool, confirm P1250 and note freeze frame data; attempt to reproduce the fault
- Visually inspect EVAP heater, harness, connectors, fuses, and any associated relays for obvious damage or corrosion
- With ignition off, disconnect heater connector and measure resistance of the heater element to ground and between terminals — compare to service values or verify it is not open
- Check fuse(s) and relay feeding the heater circuit; replace if blown or faulty
- Reconnect and backprobe heater connector. With scan tool commanding heater ON, verify supply voltage and ground presence at the connector; no voltage indicates open feed or relay/fuse fault
- If voltage present but heater not drawing current, suspect open heater element or poor ground; bench-test the heater by applying fused 12 V briefly and observe function/resistance
- Inspect and repair any damaged wiring, connectors, or grounds found. If wiring and connector are good but heater still fails, replace heater element
- If wiring and heater test good, but ECM output does not switch or shows abnormal behavior, test or replace the relay or investigate ECM driver circuit; consult manufacturer procedures before replacing ECM
- Clear codes, perform readiness/functional test, and road-test to confirm code does not return
Likely causes
- Damaged or disconnected harness to EVAP heater
- Corroded or loose connector at the heater or ground
- Failed heater element (measured open or out-of-spec resistance)
- Blown inline fuse or failed relay in the heater supply
- Short to battery or ground caused by insulation failure
- Faulty ECM output stage (less common)
Fault status
Status
Electrical fault detected in the Early Fuel Evaporation (EVAP) Heater circuit. Possible open, short, high resistance, or control driver failure preventing proper heater operation.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1250
VOLKSWAGEN
P — Powertrain
Fuel Level Too Low
Views:
UK: 28
EN: 34
RU: 34
AI status
Completed
Completed
100%
Causes
- Open or short in EVAP heater wiring
- Failed EVAP heater element (heater coil burned/open)
- Poor or corroded connector or terminal at the heater or ECU
- Blown fuse or failed relay supplying the heater circuit
- ECM/PCM driver fault or internal control module error
- Intermittent wiring damage (chafing, water intrusion)
Symptoms
- Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
- Stored P1250 code (may be accompanied by other EVAP codes)
- Possible poor cold start behavior or drivability complaints in rare cases
- Failed emissions test or elevated evaporative emissions
- Occasional fuel odor near EVAP canister area if purge operation affected
What to check
- Use a scan tool to read DTC, freeze frame data and EVAP heater commanded status
- Visually inspect wiring, connectors, and the heater element for damage or corrosion
- Check related fuses and relays for continuity and correct operation
- Backprobe the heater connector and monitor voltage/ground while commanding the heater ON/OFF with a scan tool
- Measure heater element resistance with multimeter at the connector (with power removed)
- Wiggle test wiring while monitoring circuit voltage or resistance for intermittent faults
Signal parameters
- Control signal: ECM commands ON/OFF (digital output) when EVAP heater is requested
- Expected supply voltage at heater connector: approximately battery voltage when commanded ON (typical 9–14 V)
- Heater element resistance: typically low (a few ohms); should not be open — exact value varies by model
- Current draw: moderate when energized; excessive current suggests short, very high/zero current suggests open circuit or open heater
Diagnostic algorithm
- Connect a scan tool, confirm P1250 and note freeze frame data; attempt to reproduce the fault
- Visually inspect EVAP heater, harness, connectors, fuses, and any associated relays for obvious damage or corrosion
- With ignition off, disconnect heater connector and measure resistance of the heater element to ground and between terminals — compare to service values or verify it is not open
- Check fuse(s) and relay feeding the heater circuit; replace if blown or faulty
- Reconnect and backprobe heater connector. With scan tool commanding heater ON, verify supply voltage and ground presence at the connector; no voltage indicates open feed or relay/fuse fault
- If voltage present but heater not drawing current, suspect open heater element or poor ground; bench-test the heater by applying fused 12 V briefly and observe function/resistance
- Inspect and repair any damaged wiring, connectors, or grounds found. If wiring and connector are good but heater still fails, replace heater element
- If wiring and heater test good, but ECM output does not switch or shows abnormal behavior, test or replace the relay or investigate ECM driver circuit; consult manufacturer procedures before replacing ECM
- Clear codes, perform readiness/functional test, and road-test to confirm code does not return
Likely causes
- Damaged or disconnected harness to EVAP heater
- Corroded or loose connector at the heater or ground
- Failed heater element (measured open or out-of-spec resistance)
- Blown inline fuse or failed relay in the heater supply
- Short to battery or ground caused by insulation failure
- Faulty ECM output stage (less common)
Fault status
Status
Electrical fault detected in the Early Fuel Evaporation (EVAP) Heater circuit. Possible open, short, high resistance, or control driver failure preventing proper heater operation.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
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Was this AI description helpful?
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0
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