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Home / DTC / P2146 — Fuel Injector Group A Supply Voltage Circuit/Open

P2146 — Fuel Injector Group A Supply Voltage Circuit/Open

Detailed page for trouble code P2146.

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22,491specific
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Code

P2146

Generic P — Powertrain

Fuel Injector Group A Supply Voltage Circuit/Open

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

Causes

  • Blown or missing fuse for injector supply
  • Faulty injector power relay
  • Open or damaged wiring/harness (broken conductor, connector corrosion) in injector supply circuit
  • Poor or missing ground related to injector power circuit or ECM
  • Faulty injector connector or short to open
  • Failed ECM/injector driver output (less common)

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Engine rough idle, misfire(s), or runs on fewer cylinders
  • Hard starting or no-start condition on affected cylinders
  • Reduced engine power, poor acceleration
  • Degraded fuel economy
  • Stored misfire codes alongside P2146

What to check

  • Read freeze frame and live data with a scan tool; note which injector group/cylinders are affected
  • Inspect fuses and relays related to fuel injectors and PCM power
  • Visually inspect wiring harness, connectors and injector group connector for damage, corrosion or water intrusion
  • Check for continuity between injector power source (battery/fuse/relay) and injector group connector
  • Backprobe injector supply terminal with ignition ON and cranking to verify presence of battery voltage
  • Measure injector coil resistance (if safe to disconnect) and compare to spec

Signal parameters

  • Expected injector supply voltage (key ON, engine off): approximately battery voltage ~12.0–14.5 V (may be slightly lower under load)
  • Expected during cranking: close to battery voltage (no large voltage drop)
  • Typical injector coil resistance: commonly 1–18 ohms depending on injector type — consult vehicle spec before replacing
  • No open-circuit: continuity from fuse/relay feed to injector group connector (near 0 ohms except wiring length resistance)

Diagnostic algorithm

  1. Retrieve freeze frame data and any related DTCs. Note affected injector group/cylinders and freeze conditions.
  2. Perform a visual inspection of fuses, relays, engine harness, injector connectors and PCM connector for damage, corrosion, loose pins or water entry.
  3. Verify fuses and relays: check continuity of the injector supply fuse and operation of the fuel/injector relay. Replace if faulty.
  4. With ignition ON (engine off) backprobe the injector group power terminal(s) and verify battery voltage present at the connector. If voltage is present, problem may be downstream (injector or driver). If voltage is absent, continue to step 5.
  5. Trace the supply circuit from the fuse/relay to the injector group connector: check for continuity and pinpoint open circuit or high-resistance connection. Repair broken wires or corroded terminals.
  6. Check PCM/ECM power and ground points for proper voltage and continuity. Repair poor grounds or power feeds.
  7. If supply voltage and wiring check good, inspect injector connectors and measure individual injector resistance. If an injector is shorted to ground or open that can affect the group feed.
  8. If all wiring, fuses, relays and injectors test normal, suspect ECM driver fault — verify with manufacturer procedure or substitute known-good ECM if applicable.
  9. After repairs, clear codes and perform functional test/road test to confirm the fault does not return.

Likely causes

  • Blown fuse or failed relay on injector power feed
  • Open/plugged/frayed wiring between battery/fuse/relay and injector rail or injector group connector
  • Corroded or pushed-out terminal at the injector group connector or fuse box
  • Faulty or loose ground near ECM or injector harness
  • Failing ECM driver when other items check good

Fault status

⚠️ Status
Open or missing supply voltage detected on Fuel Injector Group A supply circuit — check fuses, relay, wiring/connectors and ECM power/grounds.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

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Code

P2146

ISUZU P — Powertrain

Fuel Injector Group 1 Supply Voltage Circuit

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

Causes

  • Blown or missing fuse for injector supply
  • Faulty injector power relay
  • Open or damaged wiring/harness (broken conductor, connector corrosion) in injector supply circuit
  • Poor or missing ground related to injector power circuit or ECM
  • Faulty injector connector or short to open
  • Failed ECM/injector driver output (less common)

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Engine rough idle, misfire(s), or runs on fewer cylinders
  • Hard starting or no-start condition on affected cylinders
  • Reduced engine power, poor acceleration
  • Degraded fuel economy
  • Stored misfire codes alongside P2146

What to check

  • Read freeze frame and live data with a scan tool; note which injector group/cylinders are affected
  • Inspect fuses and relays related to fuel injectors and PCM power
  • Visually inspect wiring harness, connectors and injector group connector for damage, corrosion or water intrusion
  • Check for continuity between injector power source (battery/fuse/relay) and injector group connector
  • Backprobe injector supply terminal with ignition ON and cranking to verify presence of battery voltage
  • Measure injector coil resistance (if safe to disconnect) and compare to spec

Signal parameters

  • Expected injector supply voltage (key ON, engine off): approximately battery voltage ~12.0–14.5 V (may be slightly lower under load)
  • Expected during cranking: close to battery voltage (no large voltage drop)
  • Typical injector coil resistance: commonly 1–18 ohms depending on injector type — consult vehicle spec before replacing
  • No open-circuit: continuity from fuse/relay feed to injector group connector (near 0 ohms except wiring length resistance)

Diagnostic algorithm

  1. Retrieve freeze frame data and any related DTCs. Note affected injector group/cylinders and freeze conditions.
  2. Perform a visual inspection of fuses, relays, engine harness, injector connectors and PCM connector for damage, corrosion, loose pins or water entry.
  3. Verify fuses and relays: check continuity of the injector supply fuse and operation of the fuel/injector relay. Replace if faulty.
  4. With ignition ON (engine off) backprobe the injector group power terminal(s) and verify battery voltage present at the connector. If voltage is present, problem may be downstream (injector or driver). If voltage is absent, continue to step 5.
  5. Trace the supply circuit from the fuse/relay to the injector group connector: check for continuity and pinpoint open circuit or high-resistance connection. Repair broken wires or corroded terminals.
  6. Check PCM/ECM power and ground points for proper voltage and continuity. Repair poor grounds or power feeds.
  7. If supply voltage and wiring check good, inspect injector connectors and measure individual injector resistance. If an injector is shorted to ground or open that can affect the group feed.
  8. If all wiring, fuses, relays and injectors test normal, suspect ECM driver fault — verify with manufacturer procedure or substitute known-good ECM if applicable.
  9. After repairs, clear codes and perform functional test/road test to confirm the fault does not return.

Likely causes

  • Blown fuse or failed relay on injector power feed
  • Open/plugged/frayed wiring between battery/fuse/relay and injector rail or injector group connector
  • Corroded or pushed-out terminal at the injector group connector or fuse box
  • Faulty or loose ground near ECM or injector harness
  • Failing ECM driver when other items check good

Fault status

⚠️ Status
Open or missing supply voltage detected on Fuel Injector Group A supply circuit — check fuses, relay, wiring/connectors and ECM power/grounds.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P0200 P0201 P0202 P0203 P0204 P0205
Repair manuals

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86

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Code

P2146

LAND ROVER P — Powertrain

Fuel injector group A supply voltage - open circuit

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

Causes

  • Blown or missing fuse for injector supply
  • Faulty injector power relay
  • Open or damaged wiring/harness (broken conductor, connector corrosion) in injector supply circuit
  • Poor or missing ground related to injector power circuit or ECM
  • Faulty injector connector or short to open
  • Failed ECM/injector driver output (less common)

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Engine rough idle, misfire(s), or runs on fewer cylinders
  • Hard starting or no-start condition on affected cylinders
  • Reduced engine power, poor acceleration
  • Degraded fuel economy
  • Stored misfire codes alongside P2146

What to check

  • Read freeze frame and live data with a scan tool; note which injector group/cylinders are affected
  • Inspect fuses and relays related to fuel injectors and PCM power
  • Visually inspect wiring harness, connectors and injector group connector for damage, corrosion or water intrusion
  • Check for continuity between injector power source (battery/fuse/relay) and injector group connector
  • Backprobe injector supply terminal with ignition ON and cranking to verify presence of battery voltage
  • Measure injector coil resistance (if safe to disconnect) and compare to spec

Signal parameters

  • Expected injector supply voltage (key ON, engine off): approximately battery voltage ~12.0–14.5 V (may be slightly lower under load)
  • Expected during cranking: close to battery voltage (no large voltage drop)
  • Typical injector coil resistance: commonly 1–18 ohms depending on injector type — consult vehicle spec before replacing
  • No open-circuit: continuity from fuse/relay feed to injector group connector (near 0 ohms except wiring length resistance)

Diagnostic algorithm

  1. Retrieve freeze frame data and any related DTCs. Note affected injector group/cylinders and freeze conditions.
  2. Perform a visual inspection of fuses, relays, engine harness, injector connectors and PCM connector for damage, corrosion, loose pins or water entry.
  3. Verify fuses and relays: check continuity of the injector supply fuse and operation of the fuel/injector relay. Replace if faulty.
  4. With ignition ON (engine off) backprobe the injector group power terminal(s) and verify battery voltage present at the connector. If voltage is present, problem may be downstream (injector or driver). If voltage is absent, continue to step 5.
  5. Trace the supply circuit from the fuse/relay to the injector group connector: check for continuity and pinpoint open circuit or high-resistance connection. Repair broken wires or corroded terminals.
  6. Check PCM/ECM power and ground points for proper voltage and continuity. Repair poor grounds or power feeds.
  7. If supply voltage and wiring check good, inspect injector connectors and measure individual injector resistance. If an injector is shorted to ground or open that can affect the group feed.
  8. If all wiring, fuses, relays and injectors test normal, suspect ECM driver fault — verify with manufacturer procedure or substitute known-good ECM if applicable.
  9. After repairs, clear codes and perform functional test/road test to confirm the fault does not return.

Likely causes

  • Blown fuse or failed relay on injector power feed
  • Open/plugged/frayed wiring between battery/fuse/relay and injector rail or injector group connector
  • Corroded or pushed-out terminal at the injector group connector or fuse box
  • Faulty or loose ground near ECM or injector harness
  • Failing ECM driver when other items check good

Fault status

⚠️ Status
Open or missing supply voltage detected on Fuel Injector Group A supply circuit — check fuses, relay, wiring/connectors and ECM power/grounds.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P0200 P0201 P0202 P0203 P0204 P0205
320

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Code

P2146

MITSUBISHI P — Powertrain

Injector common circuit1 open

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

Causes

  • Blown or missing fuse for injector supply
  • Faulty injector power relay
  • Open or damaged wiring/harness (broken conductor, connector corrosion) in injector supply circuit
  • Poor or missing ground related to injector power circuit or ECM
  • Faulty injector connector or short to open
  • Failed ECM/injector driver output (less common)

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Engine rough idle, misfire(s), or runs on fewer cylinders
  • Hard starting or no-start condition on affected cylinders
  • Reduced engine power, poor acceleration
  • Degraded fuel economy
  • Stored misfire codes alongside P2146

What to check

  • Read freeze frame and live data with a scan tool; note which injector group/cylinders are affected
  • Inspect fuses and relays related to fuel injectors and PCM power
  • Visually inspect wiring harness, connectors and injector group connector for damage, corrosion or water intrusion
  • Check for continuity between injector power source (battery/fuse/relay) and injector group connector
  • Backprobe injector supply terminal with ignition ON and cranking to verify presence of battery voltage
  • Measure injector coil resistance (if safe to disconnect) and compare to spec

Signal parameters

  • Expected injector supply voltage (key ON, engine off): approximately battery voltage ~12.0–14.5 V (may be slightly lower under load)
  • Expected during cranking: close to battery voltage (no large voltage drop)
  • Typical injector coil resistance: commonly 1–18 ohms depending on injector type — consult vehicle spec before replacing
  • No open-circuit: continuity from fuse/relay feed to injector group connector (near 0 ohms except wiring length resistance)

Diagnostic algorithm

  1. Retrieve freeze frame data and any related DTCs. Note affected injector group/cylinders and freeze conditions.
  2. Perform a visual inspection of fuses, relays, engine harness, injector connectors and PCM connector for damage, corrosion, loose pins or water entry.
  3. Verify fuses and relays: check continuity of the injector supply fuse and operation of the fuel/injector relay. Replace if faulty.
  4. With ignition ON (engine off) backprobe the injector group power terminal(s) and verify battery voltage present at the connector. If voltage is present, problem may be downstream (injector or driver). If voltage is absent, continue to step 5.
  5. Trace the supply circuit from the fuse/relay to the injector group connector: check for continuity and pinpoint open circuit or high-resistance connection. Repair broken wires or corroded terminals.
  6. Check PCM/ECM power and ground points for proper voltage and continuity. Repair poor grounds or power feeds.
  7. If supply voltage and wiring check good, inspect injector connectors and measure individual injector resistance. If an injector is shorted to ground or open that can affect the group feed.
  8. If all wiring, fuses, relays and injectors test normal, suspect ECM driver fault — verify with manufacturer procedure or substitute known-good ECM if applicable.
  9. After repairs, clear codes and perform functional test/road test to confirm the fault does not return.

Likely causes

  • Blown fuse or failed relay on injector power feed
  • Open/plugged/frayed wiring between battery/fuse/relay and injector rail or injector group connector
  • Corroded or pushed-out terminal at the injector group connector or fuse box
  • Faulty or loose ground near ECM or injector harness
  • Failing ECM driver when other items check good

Fault status

⚠️ Status
Open or missing supply voltage detected on Fuel Injector Group A supply circuit — check fuses, relay, wiring/connectors and ECM power/grounds.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

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MITSUBISHI

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