Home / DTC / B1317 — Battery voltage too high

B1317 — Battery voltage too high

Detailed page for trouble code B1317.

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Code

B1317

ALFA ROMEO B — Body

Battery voltage too high

Brand: ALFA ROMEO
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty alternator voltage regulator (internal or external)
  • Stuck regulator diode or failed alternator diodes causing overvoltage
  • Open or shorted voltage sense/wiring (battery positive sense to ECU)
  • Poor or intermittent ground connections causing incorrect sensing
  • Faulty battery or internal cell condition affecting sensing
  • Aftermarket battery charger, maintainer or jump-starting while engine running

Symptoms

  • Battery/charging system warning lamp or message
  • Stored B1317 DTC (may appear intermittently)
  • Measured charging voltage above normal (bright headlights, overvoltage readings)
  • Blown fuses or electrical component failures if overvoltage is high or prolonged
  • Erratic electronics behaviour or instrument cluster warnings

What to check

  • Read and record freeze-frame data and all stored DTCs with a suitable scan tool
  • Visually inspect battery, battery terminals and main ground connections for corrosion, looseness or damage
  • Check for any external chargers/maintainers connected to the battery
  • Measure battery voltage with engine off at battery terminals
  • Start engine and measure charging voltage at idle and at ~2000 rpm
  • Inspect alternator connector, wiring and harness for damage or corrosion

Signal parameters

  • Battery voltage (engine off): ~12.4–12.7 V (fully charged)
  • Normal charging voltage (engine running): ~13.5–14.8 V
  • Typical overvoltage threshold that may set B1317: >15.5–16.0 V (manufacturer-specific)
  • AC ripple on alternator output: should be low, typically
  • Alternator output current: varies with load — verify against specification for vehicle/engine

Diagnostic algorithm

  1. Verify code and any freeze-frame data; note conditions when code set (engine speed, load, temperature)
  2. With engine off, measure battery open-circuit voltage at battery posts; record value
  3. Start engine and measure charging voltage at battery posts at idle and ~2000 rpm; note voltage with accessories on/off
  4. If measured voltage is normal, clear codes and perform road test to try to reproduce; re-scan after test
  5. If overvoltage is present, disconnect any external chargers or maintainers and retest
  6. Inspect battery positive sense wiring from battery to engine wiring harness and to ECU for shorts to B+ or open circuits; repair as required
  7. Inspect and test main battery/engine/chassis grounds; clean and tighten connections
  8. Bench-test or load-test battery to verify condition; replace battery if suspect
  9. Test alternator output and regulator: check for excessive voltage, check diode bridge (AC ripple), and verify regulator control signals where accessible
  10. If alternator/regulator fails tests, replace or rebuild alternator with correct OEM-specified unit
  11. After repairs, clear codes, perform charging system checks under load and drive-cycle; confirm code does not return
  12. If charging system and wiring test OK but code persists, test the ECU voltage-sense input or consult factory service information for ECU software updates or known issues

Likely causes

  • Internal alternator/regulator failure
  • Battery positive sense wiring shorted to B+ or open circuit
  • Bad battery (internal fault)
  • Poor chassis or engine ground at battery or ECU

Fault status

⚠️ Status
Control module detected battery/charging system voltage above the allowed threshold. Overvoltage condition recorded; code set to protect vehicle electronics. Requires inspection of alternator/regulator, battery sensing wiring and battery.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours
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Code

B1317

FIAT B — Body

Battery voltage too high

Brand: FIAT
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty alternator voltage regulator (internal or external)
  • Stuck regulator diode or failed alternator diodes causing overvoltage
  • Open or shorted voltage sense/wiring (battery positive sense to ECU)
  • Poor or intermittent ground connections causing incorrect sensing
  • Faulty battery or internal cell condition affecting sensing
  • Aftermarket battery charger, maintainer or jump-starting while engine running

Symptoms

  • Battery/charging system warning lamp or message
  • Stored B1317 DTC (may appear intermittently)
  • Measured charging voltage above normal (bright headlights, overvoltage readings)
  • Blown fuses or electrical component failures if overvoltage is high or prolonged
  • Erratic electronics behaviour or instrument cluster warnings

What to check

  • Read and record freeze-frame data and all stored DTCs with a suitable scan tool
  • Visually inspect battery, battery terminals and main ground connections for corrosion, looseness or damage
  • Check for any external chargers/maintainers connected to the battery
  • Measure battery voltage with engine off at battery terminals
  • Start engine and measure charging voltage at idle and at ~2000 rpm
  • Inspect alternator connector, wiring and harness for damage or corrosion

Signal parameters

  • Battery voltage (engine off): ~12.4–12.7 V (fully charged)
  • Normal charging voltage (engine running): ~13.5–14.8 V
  • Typical overvoltage threshold that may set B1317: >15.5–16.0 V (manufacturer-specific)
  • AC ripple on alternator output: should be low, typically
  • Alternator output current: varies with load — verify against specification for vehicle/engine

Diagnostic algorithm

  1. Verify code and any freeze-frame data; note conditions when code set (engine speed, load, temperature)
  2. With engine off, measure battery open-circuit voltage at battery posts; record value
  3. Start engine and measure charging voltage at battery posts at idle and ~2000 rpm; note voltage with accessories on/off
  4. If measured voltage is normal, clear codes and perform road test to try to reproduce; re-scan after test
  5. If overvoltage is present, disconnect any external chargers or maintainers and retest
  6. Inspect battery positive sense wiring from battery to engine wiring harness and to ECU for shorts to B+ or open circuits; repair as required
  7. Inspect and test main battery/engine/chassis grounds; clean and tighten connections
  8. Bench-test or load-test battery to verify condition; replace battery if suspect
  9. Test alternator output and regulator: check for excessive voltage, check diode bridge (AC ripple), and verify regulator control signals where accessible
  10. If alternator/regulator fails tests, replace or rebuild alternator with correct OEM-specified unit
  11. After repairs, clear codes, perform charging system checks under load and drive-cycle; confirm code does not return
  12. If charging system and wiring test OK but code persists, test the ECU voltage-sense input or consult factory service information for ECU software updates or known issues

Likely causes

  • Internal alternator/regulator failure
  • Battery positive sense wiring shorted to B+ or open circuit
  • Bad battery (internal fault)
  • Poor chassis or engine ground at battery or ECU

Fault status

⚠️ Status
Control module detected battery/charging system voltage above the allowed threshold. Overvoltage condition recorded; code set to protect vehicle electronics. Requires inspection of alternator/regulator, battery sensing wiring and battery.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours
Repair manuals

Manual library for FIAT

26

Browse 26 FIAT manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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Code

B1317

Generic B — Body

Battery Voltage High

Brand: Generic
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty alternator voltage regulator (internal or external)
  • Stuck regulator diode or failed alternator diodes causing overvoltage
  • Open or shorted voltage sense/wiring (battery positive sense to ECU)
  • Poor or intermittent ground connections causing incorrect sensing
  • Faulty battery or internal cell condition affecting sensing
  • Aftermarket battery charger, maintainer or jump-starting while engine running

Symptoms

  • Battery/charging system warning lamp or message
  • Stored B1317 DTC (may appear intermittently)
  • Measured charging voltage above normal (bright headlights, overvoltage readings)
  • Blown fuses or electrical component failures if overvoltage is high or prolonged
  • Erratic electronics behaviour or instrument cluster warnings

What to check

  • Read and record freeze-frame data and all stored DTCs with a suitable scan tool
  • Visually inspect battery, battery terminals and main ground connections for corrosion, looseness or damage
  • Check for any external chargers/maintainers connected to the battery
  • Measure battery voltage with engine off at battery terminals
  • Start engine and measure charging voltage at idle and at ~2000 rpm
  • Inspect alternator connector, wiring and harness for damage or corrosion

Signal parameters

  • Battery voltage (engine off): ~12.4–12.7 V (fully charged)
  • Normal charging voltage (engine running): ~13.5–14.8 V
  • Typical overvoltage threshold that may set B1317: >15.5–16.0 V (manufacturer-specific)
  • AC ripple on alternator output: should be low, typically
  • Alternator output current: varies with load — verify against specification for vehicle/engine

Diagnostic algorithm

  1. Verify code and any freeze-frame data; note conditions when code set (engine speed, load, temperature)
  2. With engine off, measure battery open-circuit voltage at battery posts; record value
  3. Start engine and measure charging voltage at battery posts at idle and ~2000 rpm; note voltage with accessories on/off
  4. If measured voltage is normal, clear codes and perform road test to try to reproduce; re-scan after test
  5. If overvoltage is present, disconnect any external chargers or maintainers and retest
  6. Inspect battery positive sense wiring from battery to engine wiring harness and to ECU for shorts to B+ or open circuits; repair as required
  7. Inspect and test main battery/engine/chassis grounds; clean and tighten connections
  8. Bench-test or load-test battery to verify condition; replace battery if suspect
  9. Test alternator output and regulator: check for excessive voltage, check diode bridge (AC ripple), and verify regulator control signals where accessible
  10. If alternator/regulator fails tests, replace or rebuild alternator with correct OEM-specified unit
  11. After repairs, clear codes, perform charging system checks under load and drive-cycle; confirm code does not return
  12. If charging system and wiring test OK but code persists, test the ECU voltage-sense input or consult factory service information for ECU software updates or known issues

Likely causes

  • Internal alternator/regulator failure
  • Battery positive sense wiring shorted to B+ or open circuit
  • Bad battery (internal fault)
  • Poor chassis or engine ground at battery or ECU

Fault status

⚠️ Status
Control module detected battery/charging system voltage above the allowed threshold. Overvoltage condition recorded; code set to protect vehicle electronics. Requires inspection of alternator/regulator, battery sensing wiring and battery.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours
6,973

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Code

B1317

HUMMER B — Body

In Car Air Temperature Sensor

Brand: HUMMER
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty alternator voltage regulator (internal or external)
  • Stuck regulator diode or failed alternator diodes causing overvoltage
  • Open or shorted voltage sense/wiring (battery positive sense to ECU)
  • Poor or intermittent ground connections causing incorrect sensing
  • Faulty battery or internal cell condition affecting sensing
  • Aftermarket battery charger, maintainer or jump-starting while engine running

Symptoms

  • Battery/charging system warning lamp or message
  • Stored B1317 DTC (may appear intermittently)
  • Measured charging voltage above normal (bright headlights, overvoltage readings)
  • Blown fuses or electrical component failures if overvoltage is high or prolonged
  • Erratic electronics behaviour or instrument cluster warnings

What to check

  • Read and record freeze-frame data and all stored DTCs with a suitable scan tool
  • Visually inspect battery, battery terminals and main ground connections for corrosion, looseness or damage
  • Check for any external chargers/maintainers connected to the battery
  • Measure battery voltage with engine off at battery terminals
  • Start engine and measure charging voltage at idle and at ~2000 rpm
  • Inspect alternator connector, wiring and harness for damage or corrosion

Signal parameters

  • Battery voltage (engine off): ~12.4–12.7 V (fully charged)
  • Normal charging voltage (engine running): ~13.5–14.8 V
  • Typical overvoltage threshold that may set B1317: >15.5–16.0 V (manufacturer-specific)
  • AC ripple on alternator output: should be low, typically
  • Alternator output current: varies with load — verify against specification for vehicle/engine

Diagnostic algorithm

  1. Verify code and any freeze-frame data; note conditions when code set (engine speed, load, temperature)
  2. With engine off, measure battery open-circuit voltage at battery posts; record value
  3. Start engine and measure charging voltage at battery posts at idle and ~2000 rpm; note voltage with accessories on/off
  4. If measured voltage is normal, clear codes and perform road test to try to reproduce; re-scan after test
  5. If overvoltage is present, disconnect any external chargers or maintainers and retest
  6. Inspect battery positive sense wiring from battery to engine wiring harness and to ECU for shorts to B+ or open circuits; repair as required
  7. Inspect and test main battery/engine/chassis grounds; clean and tighten connections
  8. Bench-test or load-test battery to verify condition; replace battery if suspect
  9. Test alternator output and regulator: check for excessive voltage, check diode bridge (AC ripple), and verify regulator control signals where accessible
  10. If alternator/regulator fails tests, replace or rebuild alternator with correct OEM-specified unit
  11. After repairs, clear codes, perform charging system checks under load and drive-cycle; confirm code does not return
  12. If charging system and wiring test OK but code persists, test the ECU voltage-sense input or consult factory service information for ECU software updates or known issues

Likely causes

  • Internal alternator/regulator failure
  • Battery positive sense wiring shorted to B+ or open circuit
  • Bad battery (internal fault)
  • Poor chassis or engine ground at battery or ECU

Fault status

⚠️ Status
Control module detected battery/charging system voltage above the allowed threshold. Overvoltage condition recorded; code set to protect vehicle electronics. Requires inspection of alternator/regulator, battery sensing wiring and battery.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours
Repair manuals

Manual library for HUMMER

138

Browse 138 HUMMER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

HUMMER

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Code

B1317

LAND ROVER B — Body

High battery voltage

Brand: LAND ROVER
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty alternator voltage regulator (internal or external)
  • Stuck regulator diode or failed alternator diodes causing overvoltage
  • Open or shorted voltage sense/wiring (battery positive sense to ECU)
  • Poor or intermittent ground connections causing incorrect sensing
  • Faulty battery or internal cell condition affecting sensing
  • Aftermarket battery charger, maintainer or jump-starting while engine running

Symptoms

  • Battery/charging system warning lamp or message
  • Stored B1317 DTC (may appear intermittently)
  • Measured charging voltage above normal (bright headlights, overvoltage readings)
  • Blown fuses or electrical component failures if overvoltage is high or prolonged
  • Erratic electronics behaviour or instrument cluster warnings

What to check

  • Read and record freeze-frame data and all stored DTCs with a suitable scan tool
  • Visually inspect battery, battery terminals and main ground connections for corrosion, looseness or damage
  • Check for any external chargers/maintainers connected to the battery
  • Measure battery voltage with engine off at battery terminals
  • Start engine and measure charging voltage at idle and at ~2000 rpm
  • Inspect alternator connector, wiring and harness for damage or corrosion

Signal parameters

  • Battery voltage (engine off): ~12.4–12.7 V (fully charged)
  • Normal charging voltage (engine running): ~13.5–14.8 V
  • Typical overvoltage threshold that may set B1317: >15.5–16.0 V (manufacturer-specific)
  • AC ripple on alternator output: should be low, typically
  • Alternator output current: varies with load — verify against specification for vehicle/engine

Diagnostic algorithm

  1. Verify code and any freeze-frame data; note conditions when code set (engine speed, load, temperature)
  2. With engine off, measure battery open-circuit voltage at battery posts; record value
  3. Start engine and measure charging voltage at battery posts at idle and ~2000 rpm; note voltage with accessories on/off
  4. If measured voltage is normal, clear codes and perform road test to try to reproduce; re-scan after test
  5. If overvoltage is present, disconnect any external chargers or maintainers and retest
  6. Inspect battery positive sense wiring from battery to engine wiring harness and to ECU for shorts to B+ or open circuits; repair as required
  7. Inspect and test main battery/engine/chassis grounds; clean and tighten connections
  8. Bench-test or load-test battery to verify condition; replace battery if suspect
  9. Test alternator output and regulator: check for excessive voltage, check diode bridge (AC ripple), and verify regulator control signals where accessible
  10. If alternator/regulator fails tests, replace or rebuild alternator with correct OEM-specified unit
  11. After repairs, clear codes, perform charging system checks under load and drive-cycle; confirm code does not return
  12. If charging system and wiring test OK but code persists, test the ECU voltage-sense input or consult factory service information for ECU software updates or known issues

Likely causes

  • Internal alternator/regulator failure
  • Battery positive sense wiring shorted to B+ or open circuit
  • Bad battery (internal fault)
  • Poor chassis or engine ground at battery or ECU

Fault status

⚠️ Status
Control module detected battery/charging system voltage above the allowed threshold. Overvoltage condition recorded; code set to protect vehicle electronics. Requires inspection of alternator/regulator, battery sensing wiring and battery.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours
320

Browse 320 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

LAND ROVER

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Code

B1317

MITSUBISHI B — Body

Timeout error (5bow down)

Brand: MITSUBISHI
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty alternator voltage regulator (internal or external)
  • Stuck regulator diode or failed alternator diodes causing overvoltage
  • Open or shorted voltage sense/wiring (battery positive sense to ECU)
  • Poor or intermittent ground connections causing incorrect sensing
  • Faulty battery or internal cell condition affecting sensing
  • Aftermarket battery charger, maintainer or jump-starting while engine running

Symptoms

  • Battery/charging system warning lamp or message
  • Stored B1317 DTC (may appear intermittently)
  • Measured charging voltage above normal (bright headlights, overvoltage readings)
  • Blown fuses or electrical component failures if overvoltage is high or prolonged
  • Erratic electronics behaviour or instrument cluster warnings

What to check

  • Read and record freeze-frame data and all stored DTCs with a suitable scan tool
  • Visually inspect battery, battery terminals and main ground connections for corrosion, looseness or damage
  • Check for any external chargers/maintainers connected to the battery
  • Measure battery voltage with engine off at battery terminals
  • Start engine and measure charging voltage at idle and at ~2000 rpm
  • Inspect alternator connector, wiring and harness for damage or corrosion

Signal parameters

  • Battery voltage (engine off): ~12.4–12.7 V (fully charged)
  • Normal charging voltage (engine running): ~13.5–14.8 V
  • Typical overvoltage threshold that may set B1317: >15.5–16.0 V (manufacturer-specific)
  • AC ripple on alternator output: should be low, typically
  • Alternator output current: varies with load — verify against specification for vehicle/engine

Diagnostic algorithm

  1. Verify code and any freeze-frame data; note conditions when code set (engine speed, load, temperature)
  2. With engine off, measure battery open-circuit voltage at battery posts; record value
  3. Start engine and measure charging voltage at battery posts at idle and ~2000 rpm; note voltage with accessories on/off
  4. If measured voltage is normal, clear codes and perform road test to try to reproduce; re-scan after test
  5. If overvoltage is present, disconnect any external chargers or maintainers and retest
  6. Inspect battery positive sense wiring from battery to engine wiring harness and to ECU for shorts to B+ or open circuits; repair as required
  7. Inspect and test main battery/engine/chassis grounds; clean and tighten connections
  8. Bench-test or load-test battery to verify condition; replace battery if suspect
  9. Test alternator output and regulator: check for excessive voltage, check diode bridge (AC ripple), and verify regulator control signals where accessible
  10. If alternator/regulator fails tests, replace or rebuild alternator with correct OEM-specified unit
  11. After repairs, clear codes, perform charging system checks under load and drive-cycle; confirm code does not return
  12. If charging system and wiring test OK but code persists, test the ECU voltage-sense input or consult factory service information for ECU software updates or known issues

Likely causes

  • Internal alternator/regulator failure
  • Battery positive sense wiring shorted to B+ or open circuit
  • Bad battery (internal fault)
  • Poor chassis or engine ground at battery or ECU

Fault status

⚠️ Status
Control module detected battery/charging system voltage above the allowed threshold. Overvoltage condition recorded; code set to protect vehicle electronics. Requires inspection of alternator/regulator, battery sensing wiring and battery.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours
406

Browse 406 MITSUBISHI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

MITSUBISHI

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Code

B1317

Other B — Body

Battery Voltage High

Brand: Other
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty alternator voltage regulator (internal or external)
  • Stuck regulator diode or failed alternator diodes causing overvoltage
  • Open or shorted voltage sense/wiring (battery positive sense to ECU)
  • Poor or intermittent ground connections causing incorrect sensing
  • Faulty battery or internal cell condition affecting sensing
  • Aftermarket battery charger, maintainer or jump-starting while engine running

Symptoms

  • Battery/charging system warning lamp or message
  • Stored B1317 DTC (may appear intermittently)
  • Measured charging voltage above normal (bright headlights, overvoltage readings)
  • Blown fuses or electrical component failures if overvoltage is high or prolonged
  • Erratic electronics behaviour or instrument cluster warnings

What to check

  • Read and record freeze-frame data and all stored DTCs with a suitable scan tool
  • Visually inspect battery, battery terminals and main ground connections for corrosion, looseness or damage
  • Check for any external chargers/maintainers connected to the battery
  • Measure battery voltage with engine off at battery terminals
  • Start engine and measure charging voltage at idle and at ~2000 rpm
  • Inspect alternator connector, wiring and harness for damage or corrosion

Signal parameters

  • Battery voltage (engine off): ~12.4–12.7 V (fully charged)
  • Normal charging voltage (engine running): ~13.5–14.8 V
  • Typical overvoltage threshold that may set B1317: >15.5–16.0 V (manufacturer-specific)
  • AC ripple on alternator output: should be low, typically
  • Alternator output current: varies with load — verify against specification for vehicle/engine

Diagnostic algorithm

  1. Verify code and any freeze-frame data; note conditions when code set (engine speed, load, temperature)
  2. With engine off, measure battery open-circuit voltage at battery posts; record value
  3. Start engine and measure charging voltage at battery posts at idle and ~2000 rpm; note voltage with accessories on/off
  4. If measured voltage is normal, clear codes and perform road test to try to reproduce; re-scan after test
  5. If overvoltage is present, disconnect any external chargers or maintainers and retest
  6. Inspect battery positive sense wiring from battery to engine wiring harness and to ECU for shorts to B+ or open circuits; repair as required
  7. Inspect and test main battery/engine/chassis grounds; clean and tighten connections
  8. Bench-test or load-test battery to verify condition; replace battery if suspect
  9. Test alternator output and regulator: check for excessive voltage, check diode bridge (AC ripple), and verify regulator control signals where accessible
  10. If alternator/regulator fails tests, replace or rebuild alternator with correct OEM-specified unit
  11. After repairs, clear codes, perform charging system checks under load and drive-cycle; confirm code does not return
  12. If charging system and wiring test OK but code persists, test the ECU voltage-sense input or consult factory service information for ECU software updates or known issues

Likely causes

  • Internal alternator/regulator failure
  • Battery positive sense wiring shorted to B+ or open circuit
  • Bad battery (internal fault)
  • Poor chassis or engine ground at battery or ECU

Fault status

⚠️ Status
Control module detected battery/charging system voltage above the allowed threshold. Overvoltage condition recorded; code set to protect vehicle electronics. Requires inspection of alternator/regulator, battery sensing wiring and battery.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours
6,973

The library contains 6,973 repair and diagnostic manuals. Choose a brand to open the full manual tree by year, model and trim.

Your experience will help others
+100 karma for a short comment :)
Send to email