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Home / DTC / P1800 — TCM Power Control Relay Circuit Open

P1800 — TCM Power Control Relay Circuit Open

Detailed page for trouble code P1800.

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Code

P1800

BUICK P — Powertrain

TCM Power Control Relay Circuit Open

Brand: BUICK
Type: P — Powertrain
Views: UK: 11 EN: 27 RU: 18
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Blown fuse for TCM/relay supply
  • Faulty TCM power control relay
  • Open or corroded wiring between fuse, relay and TCM
  • Poor or disconnected relay/TCM connector pins
  • Faulty body/engine control module that drives the relay
  • Internal fault in the TCM

Symptoms

  • Transmission warning light or MIL illuminated
  • Transmission may fail to engage or operate (no shift or limp mode)
  • Loss of shift control or limited gear selection
  • Multiple transmission-related DTCs logged
  • Engine may run but transmission behaves as if unpowered

What to check

  • Read and record all stored codes and freeze frame data with a scan tool
  • Check battery voltage (should be ~12.4–13.8 V with key on and engine off)
  • Inspect related fuses and fusible links for continuity
  • Visually inspect relay, relay socket and wiring for corrosion, damage or loose terminals
  • Check for corrosion/damage at the TCM connector and ground points
  • Confirm whether the relay coil receives a control voltage when ignition is ON (backprobe safely)

Signal parameters

  • Battery/supply voltage at relay supply terminal: ~12 V (key ON or start as applicable)
  • Relay coil control voltage: 12 V (or ground depending on design) when relay is commanded ON
  • Relay coil resistance: typically low ohms (check service manual for exact), continuity present across coil when not energized
  • Voltage at TCM power feed pin: battery voltage present when relay is closed; near 0 V when open

Diagnostic algorithm

  1. Safety first: park vehicle, set parking brake, turn ignition OFF and disconnect negative battery terminal if required before disconnecting connectors
  2. Connect a scan tool, note P1800 and any related codes, clear codes and attempt to re-create with ignition ON/engine running as required
  3. Visually inspect and test the fuse(s) for the TCM/relay circuit; replace any blown fuse and retest
  4. Locate the TCM power control relay and inspect socket/terminals for corrosion or looseness; swap with identical relay to confirm function
  5. With ignition ON (engine off) backprobe relay coil terminals: verify control side is being driven (12 V or ground) when scan tool requests TCM power; if no drive, trace to the module that controls the relay
  6. Measure battery voltage at relay supply terminal and at the relay output (feed to TCM) with relay energized; if supply is present but no output when relay is energized, replace relay
  7. If relay output is present but TCM still not powered, check continuity from relay output to TCM power pin and inspect TCM connector, repair any open/corroded wiring
  8. If wiring checks OK and relay operation is correct but code persists, test/replace the module that commands the relay (refer to vehicle wiring diagram) or consider TCM internal fault and follow manufacturer procedures for TCM testing/replacement

Likely causes

  • Faulty or stuck open TCM power relay
  • Open circuit in relay supply or relay coil control wire
  • Blown related fuse or fusible link
  • Corroded/loose connector at relay or TCM harness

Fault status

⚠️ Status
Open circuit detected in TCM power control relay circuit — TCM may lose power or not initialize. Check relay, fuse, wiring and connectors for open or high-resistance conditions.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0641 P0615 P0562 P0563 P0616
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Code

P1800

CADILLAC P — Powertrain

TCM Power Control Relay Circuit Open

Brand: CADILLAC
Type: P — Powertrain
Views: UK: 11 EN: 31 RU: 17
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Blown fuse for TCM/relay supply
  • Faulty TCM power control relay
  • Open or corroded wiring between fuse, relay and TCM
  • Poor or disconnected relay/TCM connector pins
  • Faulty body/engine control module that drives the relay
  • Internal fault in the TCM

Symptoms

  • Transmission warning light or MIL illuminated
  • Transmission may fail to engage or operate (no shift or limp mode)
  • Loss of shift control or limited gear selection
  • Multiple transmission-related DTCs logged
  • Engine may run but transmission behaves as if unpowered

What to check

  • Read and record all stored codes and freeze frame data with a scan tool
  • Check battery voltage (should be ~12.4–13.8 V with key on and engine off)
  • Inspect related fuses and fusible links for continuity
  • Visually inspect relay, relay socket and wiring for corrosion, damage or loose terminals
  • Check for corrosion/damage at the TCM connector and ground points
  • Confirm whether the relay coil receives a control voltage when ignition is ON (backprobe safely)

Signal parameters

  • Battery/supply voltage at relay supply terminal: ~12 V (key ON or start as applicable)
  • Relay coil control voltage: 12 V (or ground depending on design) when relay is commanded ON
  • Relay coil resistance: typically low ohms (check service manual for exact), continuity present across coil when not energized
  • Voltage at TCM power feed pin: battery voltage present when relay is closed; near 0 V when open

Diagnostic algorithm

  1. Safety first: park vehicle, set parking brake, turn ignition OFF and disconnect negative battery terminal if required before disconnecting connectors
  2. Connect a scan tool, note P1800 and any related codes, clear codes and attempt to re-create with ignition ON/engine running as required
  3. Visually inspect and test the fuse(s) for the TCM/relay circuit; replace any blown fuse and retest
  4. Locate the TCM power control relay and inspect socket/terminals for corrosion or looseness; swap with identical relay to confirm function
  5. With ignition ON (engine off) backprobe relay coil terminals: verify control side is being driven (12 V or ground) when scan tool requests TCM power; if no drive, trace to the module that controls the relay
  6. Measure battery voltage at relay supply terminal and at the relay output (feed to TCM) with relay energized; if supply is present but no output when relay is energized, replace relay
  7. If relay output is present but TCM still not powered, check continuity from relay output to TCM power pin and inspect TCM connector, repair any open/corroded wiring
  8. If wiring checks OK and relay operation is correct but code persists, test/replace the module that commands the relay (refer to vehicle wiring diagram) or consider TCM internal fault and follow manufacturer procedures for TCM testing/replacement

Likely causes

  • Faulty or stuck open TCM power relay
  • Open circuit in relay supply or relay coil control wire
  • Blown related fuse or fusible link
  • Corroded/loose connector at relay or TCM harness

Fault status

⚠️ Status
Open circuit detected in TCM power control relay circuit — TCM may lose power or not initialize. Check relay, fuse, wiring and connectors for open or high-resistance conditions.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0641 P0615 P0562 P0563 P0616
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Code

P1800

CHEVROLET P — Powertrain

TCM Power Control Relay Circuit Open

Brand: CHEVROLET
Type: P — Powertrain
Views: UK: 11 EN: 29 RU: 18
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Blown fuse for TCM/relay supply
  • Faulty TCM power control relay
  • Open or corroded wiring between fuse, relay and TCM
  • Poor or disconnected relay/TCM connector pins
  • Faulty body/engine control module that drives the relay
  • Internal fault in the TCM

Symptoms

  • Transmission warning light or MIL illuminated
  • Transmission may fail to engage or operate (no shift or limp mode)
  • Loss of shift control or limited gear selection
  • Multiple transmission-related DTCs logged
  • Engine may run but transmission behaves as if unpowered

What to check

  • Read and record all stored codes and freeze frame data with a scan tool
  • Check battery voltage (should be ~12.4–13.8 V with key on and engine off)
  • Inspect related fuses and fusible links for continuity
  • Visually inspect relay, relay socket and wiring for corrosion, damage or loose terminals
  • Check for corrosion/damage at the TCM connector and ground points
  • Confirm whether the relay coil receives a control voltage when ignition is ON (backprobe safely)

Signal parameters

  • Battery/supply voltage at relay supply terminal: ~12 V (key ON or start as applicable)
  • Relay coil control voltage: 12 V (or ground depending on design) when relay is commanded ON
  • Relay coil resistance: typically low ohms (check service manual for exact), continuity present across coil when not energized
  • Voltage at TCM power feed pin: battery voltage present when relay is closed; near 0 V when open

Diagnostic algorithm

  1. Safety first: park vehicle, set parking brake, turn ignition OFF and disconnect negative battery terminal if required before disconnecting connectors
  2. Connect a scan tool, note P1800 and any related codes, clear codes and attempt to re-create with ignition ON/engine running as required
  3. Visually inspect and test the fuse(s) for the TCM/relay circuit; replace any blown fuse and retest
  4. Locate the TCM power control relay and inspect socket/terminals for corrosion or looseness; swap with identical relay to confirm function
  5. With ignition ON (engine off) backprobe relay coil terminals: verify control side is being driven (12 V or ground) when scan tool requests TCM power; if no drive, trace to the module that controls the relay
  6. Measure battery voltage at relay supply terminal and at the relay output (feed to TCM) with relay energized; if supply is present but no output when relay is energized, replace relay
  7. If relay output is present but TCM still not powered, check continuity from relay output to TCM power pin and inspect TCM connector, repair any open/corroded wiring
  8. If wiring checks OK and relay operation is correct but code persists, test/replace the module that commands the relay (refer to vehicle wiring diagram) or consider TCM internal fault and follow manufacturer procedures for TCM testing/replacement

Likely causes

  • Faulty or stuck open TCM power relay
  • Open circuit in relay supply or relay coil control wire
  • Blown related fuse or fusible link
  • Corroded/loose connector at relay or TCM harness

Fault status

⚠️ Status
Open circuit detected in TCM power control relay circuit — TCM may lose power or not initialize. Check relay, fuse, wiring and connectors for open or high-resistance conditions.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0641 P0615 P0562 P0563 P0616
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P1800

Generic P — Powertrain

Transmission Clutch Interlock Safety Switch Circuit Failure

Brand: Generic
Type: P — Powertrain
Views: UK: 15 EN: 36 RU: 21
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Blown fuse for TCM/relay supply
  • Faulty TCM power control relay
  • Open or corroded wiring between fuse, relay and TCM
  • Poor or disconnected relay/TCM connector pins
  • Faulty body/engine control module that drives the relay
  • Internal fault in the TCM

Symptoms

  • Transmission warning light or MIL illuminated
  • Transmission may fail to engage or operate (no shift or limp mode)
  • Loss of shift control or limited gear selection
  • Multiple transmission-related DTCs logged
  • Engine may run but transmission behaves as if unpowered

What to check

  • Read and record all stored codes and freeze frame data with a scan tool
  • Check battery voltage (should be ~12.4–13.8 V with key on and engine off)
  • Inspect related fuses and fusible links for continuity
  • Visually inspect relay, relay socket and wiring for corrosion, damage or loose terminals
  • Check for corrosion/damage at the TCM connector and ground points
  • Confirm whether the relay coil receives a control voltage when ignition is ON (backprobe safely)

Signal parameters

  • Battery/supply voltage at relay supply terminal: ~12 V (key ON or start as applicable)
  • Relay coil control voltage: 12 V (or ground depending on design) when relay is commanded ON
  • Relay coil resistance: typically low ohms (check service manual for exact), continuity present across coil when not energized
  • Voltage at TCM power feed pin: battery voltage present when relay is closed; near 0 V when open

Diagnostic algorithm

  1. Safety first: park vehicle, set parking brake, turn ignition OFF and disconnect negative battery terminal if required before disconnecting connectors
  2. Connect a scan tool, note P1800 and any related codes, clear codes and attempt to re-create with ignition ON/engine running as required
  3. Visually inspect and test the fuse(s) for the TCM/relay circuit; replace any blown fuse and retest
  4. Locate the TCM power control relay and inspect socket/terminals for corrosion or looseness; swap with identical relay to confirm function
  5. With ignition ON (engine off) backprobe relay coil terminals: verify control side is being driven (12 V or ground) when scan tool requests TCM power; if no drive, trace to the module that controls the relay
  6. Measure battery voltage at relay supply terminal and at the relay output (feed to TCM) with relay energized; if supply is present but no output when relay is energized, replace relay
  7. If relay output is present but TCM still not powered, check continuity from relay output to TCM power pin and inspect TCM connector, repair any open/corroded wiring
  8. If wiring checks OK and relay operation is correct but code persists, test/replace the module that commands the relay (refer to vehicle wiring diagram) or consider TCM internal fault and follow manufacturer procedures for TCM testing/replacement

Likely causes

  • Faulty or stuck open TCM power relay
  • Open circuit in relay supply or relay coil control wire
  • Blown related fuse or fusible link
  • Corroded/loose connector at relay or TCM harness

Fault status

⚠️ Status
Open circuit detected in TCM power control relay circuit — TCM may lose power or not initialize. Check relay, fuse, wiring and connectors for open or high-resistance conditions.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0641 P0615 P0562 P0563 P0616
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  • 1.8 How to use this document
  • 1.9 Connector detail format
  • 1.10 Fault diagnosis
  • 1.11 Wire colour codes
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Code

P1800

GM P — Powertrain

TCM Power Control Relay Circuit Open

Brand: GM
Type: P — Powertrain
Views: UK: 10 EN: 27 RU: 20
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Blown fuse for TCM/relay supply
  • Faulty TCM power control relay
  • Open or corroded wiring between fuse, relay and TCM
  • Poor or disconnected relay/TCM connector pins
  • Faulty body/engine control module that drives the relay
  • Internal fault in the TCM

Symptoms

  • Transmission warning light or MIL illuminated
  • Transmission may fail to engage or operate (no shift or limp mode)
  • Loss of shift control or limited gear selection
  • Multiple transmission-related DTCs logged
  • Engine may run but transmission behaves as if unpowered

What to check

  • Read and record all stored codes and freeze frame data with a scan tool
  • Check battery voltage (should be ~12.4–13.8 V with key on and engine off)
  • Inspect related fuses and fusible links for continuity
  • Visually inspect relay, relay socket and wiring for corrosion, damage or loose terminals
  • Check for corrosion/damage at the TCM connector and ground points
  • Confirm whether the relay coil receives a control voltage when ignition is ON (backprobe safely)

Signal parameters

  • Battery/supply voltage at relay supply terminal: ~12 V (key ON or start as applicable)
  • Relay coil control voltage: 12 V (or ground depending on design) when relay is commanded ON
  • Relay coil resistance: typically low ohms (check service manual for exact), continuity present across coil when not energized
  • Voltage at TCM power feed pin: battery voltage present when relay is closed; near 0 V when open

Diagnostic algorithm

  1. Safety first: park vehicle, set parking brake, turn ignition OFF and disconnect negative battery terminal if required before disconnecting connectors
  2. Connect a scan tool, note P1800 and any related codes, clear codes and attempt to re-create with ignition ON/engine running as required
  3. Visually inspect and test the fuse(s) for the TCM/relay circuit; replace any blown fuse and retest
  4. Locate the TCM power control relay and inspect socket/terminals for corrosion or looseness; swap with identical relay to confirm function
  5. With ignition ON (engine off) backprobe relay coil terminals: verify control side is being driven (12 V or ground) when scan tool requests TCM power; if no drive, trace to the module that controls the relay
  6. Measure battery voltage at relay supply terminal and at the relay output (feed to TCM) with relay energized; if supply is present but no output when relay is energized, replace relay
  7. If relay output is present but TCM still not powered, check continuity from relay output to TCM power pin and inspect TCM connector, repair any open/corroded wiring
  8. If wiring checks OK and relay operation is correct but code persists, test/replace the module that commands the relay (refer to vehicle wiring diagram) or consider TCM internal fault and follow manufacturer procedures for TCM testing/replacement

Likely causes

  • Faulty or stuck open TCM power relay
  • Open circuit in relay supply or relay coil control wire
  • Blown related fuse or fusible link
  • Corroded/loose connector at relay or TCM harness

Fault status

⚠️ Status
Open circuit detected in TCM power control relay circuit — TCM may lose power or not initialize. Check relay, fuse, wiring and connectors for open or high-resistance conditions.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0641 P0615 P0562 P0563 P0616
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Code

P1800

GMC P — Powertrain

TCM Power Control Relay Circuit Open

Brand: GMC
Type: P — Powertrain
Views: UK: 13 EN: 34 RU: 19
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Blown fuse for TCM/relay supply
  • Faulty TCM power control relay
  • Open or corroded wiring between fuse, relay and TCM
  • Poor or disconnected relay/TCM connector pins
  • Faulty body/engine control module that drives the relay
  • Internal fault in the TCM

Symptoms

  • Transmission warning light or MIL illuminated
  • Transmission may fail to engage or operate (no shift or limp mode)
  • Loss of shift control or limited gear selection
  • Multiple transmission-related DTCs logged
  • Engine may run but transmission behaves as if unpowered

What to check

  • Read and record all stored codes and freeze frame data with a scan tool
  • Check battery voltage (should be ~12.4–13.8 V with key on and engine off)
  • Inspect related fuses and fusible links for continuity
  • Visually inspect relay, relay socket and wiring for corrosion, damage or loose terminals
  • Check for corrosion/damage at the TCM connector and ground points
  • Confirm whether the relay coil receives a control voltage when ignition is ON (backprobe safely)

Signal parameters

  • Battery/supply voltage at relay supply terminal: ~12 V (key ON or start as applicable)
  • Relay coil control voltage: 12 V (or ground depending on design) when relay is commanded ON
  • Relay coil resistance: typically low ohms (check service manual for exact), continuity present across coil when not energized
  • Voltage at TCM power feed pin: battery voltage present when relay is closed; near 0 V when open

Diagnostic algorithm

  1. Safety first: park vehicle, set parking brake, turn ignition OFF and disconnect negative battery terminal if required before disconnecting connectors
  2. Connect a scan tool, note P1800 and any related codes, clear codes and attempt to re-create with ignition ON/engine running as required
  3. Visually inspect and test the fuse(s) for the TCM/relay circuit; replace any blown fuse and retest
  4. Locate the TCM power control relay and inspect socket/terminals for corrosion or looseness; swap with identical relay to confirm function
  5. With ignition ON (engine off) backprobe relay coil terminals: verify control side is being driven (12 V or ground) when scan tool requests TCM power; if no drive, trace to the module that controls the relay
  6. Measure battery voltage at relay supply terminal and at the relay output (feed to TCM) with relay energized; if supply is present but no output when relay is energized, replace relay
  7. If relay output is present but TCM still not powered, check continuity from relay output to TCM power pin and inspect TCM connector, repair any open/corroded wiring
  8. If wiring checks OK and relay operation is correct but code persists, test/replace the module that commands the relay (refer to vehicle wiring diagram) or consider TCM internal fault and follow manufacturer procedures for TCM testing/replacement

Likely causes

  • Faulty or stuck open TCM power relay
  • Open circuit in relay supply or relay coil control wire
  • Blown related fuse or fusible link
  • Corroded/loose connector at relay or TCM harness

Fault status

⚠️ Status
Open circuit detected in TCM power control relay circuit — TCM may lose power or not initialize. Check relay, fuse, wiring and connectors for open or high-resistance conditions.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0641 P0615 P0562 P0563 P0616
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Code

P1800

HUMMER P — Powertrain

TCM Power Relay Control Circuit

Brand: HUMMER
Type: P — Powertrain
Views: UK: 5 EN: 18 RU: 12
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Blown fuse for TCM/relay supply
  • Faulty TCM power control relay
  • Open or corroded wiring between fuse, relay and TCM
  • Poor or disconnected relay/TCM connector pins
  • Faulty body/engine control module that drives the relay
  • Internal fault in the TCM

Symptoms

  • Transmission warning light or MIL illuminated
  • Transmission may fail to engage or operate (no shift or limp mode)
  • Loss of shift control or limited gear selection
  • Multiple transmission-related DTCs logged
  • Engine may run but transmission behaves as if unpowered

What to check

  • Read and record all stored codes and freeze frame data with a scan tool
  • Check battery voltage (should be ~12.4–13.8 V with key on and engine off)
  • Inspect related fuses and fusible links for continuity
  • Visually inspect relay, relay socket and wiring for corrosion, damage or loose terminals
  • Check for corrosion/damage at the TCM connector and ground points
  • Confirm whether the relay coil receives a control voltage when ignition is ON (backprobe safely)

Signal parameters

  • Battery/supply voltage at relay supply terminal: ~12 V (key ON or start as applicable)
  • Relay coil control voltage: 12 V (or ground depending on design) when relay is commanded ON
  • Relay coil resistance: typically low ohms (check service manual for exact), continuity present across coil when not energized
  • Voltage at TCM power feed pin: battery voltage present when relay is closed; near 0 V when open

Diagnostic algorithm

  1. Safety first: park vehicle, set parking brake, turn ignition OFF and disconnect negative battery terminal if required before disconnecting connectors
  2. Connect a scan tool, note P1800 and any related codes, clear codes and attempt to re-create with ignition ON/engine running as required
  3. Visually inspect and test the fuse(s) for the TCM/relay circuit; replace any blown fuse and retest
  4. Locate the TCM power control relay and inspect socket/terminals for corrosion or looseness; swap with identical relay to confirm function
  5. With ignition ON (engine off) backprobe relay coil terminals: verify control side is being driven (12 V or ground) when scan tool requests TCM power; if no drive, trace to the module that controls the relay
  6. Measure battery voltage at relay supply terminal and at the relay output (feed to TCM) with relay energized; if supply is present but no output when relay is energized, replace relay
  7. If relay output is present but TCM still not powered, check continuity from relay output to TCM power pin and inspect TCM connector, repair any open/corroded wiring
  8. If wiring checks OK and relay operation is correct but code persists, test/replace the module that commands the relay (refer to vehicle wiring diagram) or consider TCM internal fault and follow manufacturer procedures for TCM testing/replacement

Likely causes

  • Faulty or stuck open TCM power relay
  • Open circuit in relay supply or relay coil control wire
  • Blown related fuse or fusible link
  • Corroded/loose connector at relay or TCM harness

Fault status

⚠️ Status
Open circuit detected in TCM power control relay circuit — TCM may lose power or not initialize. Check relay, fuse, wiring and connectors for open or high-resistance conditions.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0641 P0615 P0562 P0563 P0616
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Code

P1800

MITSUBISHI P — Powertrain

Automated-M/T fail(relay OFF)

Brand: MITSUBISHI
Type: P — Powertrain
Views: UK: 7 EN: 18 RU: 10
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Blown fuse for TCM/relay supply
  • Faulty TCM power control relay
  • Open or corroded wiring between fuse, relay and TCM
  • Poor or disconnected relay/TCM connector pins
  • Faulty body/engine control module that drives the relay
  • Internal fault in the TCM

Symptoms

  • Transmission warning light or MIL illuminated
  • Transmission may fail to engage or operate (no shift or limp mode)
  • Loss of shift control or limited gear selection
  • Multiple transmission-related DTCs logged
  • Engine may run but transmission behaves as if unpowered

What to check

  • Read and record all stored codes and freeze frame data with a scan tool
  • Check battery voltage (should be ~12.4–13.8 V with key on and engine off)
  • Inspect related fuses and fusible links for continuity
  • Visually inspect relay, relay socket and wiring for corrosion, damage or loose terminals
  • Check for corrosion/damage at the TCM connector and ground points
  • Confirm whether the relay coil receives a control voltage when ignition is ON (backprobe safely)

Signal parameters

  • Battery/supply voltage at relay supply terminal: ~12 V (key ON or start as applicable)
  • Relay coil control voltage: 12 V (or ground depending on design) when relay is commanded ON
  • Relay coil resistance: typically low ohms (check service manual for exact), continuity present across coil when not energized
  • Voltage at TCM power feed pin: battery voltage present when relay is closed; near 0 V when open

Diagnostic algorithm

  1. Safety first: park vehicle, set parking brake, turn ignition OFF and disconnect negative battery terminal if required before disconnecting connectors
  2. Connect a scan tool, note P1800 and any related codes, clear codes and attempt to re-create with ignition ON/engine running as required
  3. Visually inspect and test the fuse(s) for the TCM/relay circuit; replace any blown fuse and retest
  4. Locate the TCM power control relay and inspect socket/terminals for corrosion or looseness; swap with identical relay to confirm function
  5. With ignition ON (engine off) backprobe relay coil terminals: verify control side is being driven (12 V or ground) when scan tool requests TCM power; if no drive, trace to the module that controls the relay
  6. Measure battery voltage at relay supply terminal and at the relay output (feed to TCM) with relay energized; if supply is present but no output when relay is energized, replace relay
  7. If relay output is present but TCM still not powered, check continuity from relay output to TCM power pin and inspect TCM connector, repair any open/corroded wiring
  8. If wiring checks OK and relay operation is correct but code persists, test/replace the module that commands the relay (refer to vehicle wiring diagram) or consider TCM internal fault and follow manufacturer procedures for TCM testing/replacement

Likely causes

  • Faulty or stuck open TCM power relay
  • Open circuit in relay supply or relay coil control wire
  • Blown related fuse or fusible link
  • Corroded/loose connector at relay or TCM harness

Fault status

⚠️ Status
Open circuit detected in TCM power control relay circuit — TCM may lose power or not initialize. Check relay, fuse, wiring and connectors for open or high-resistance conditions.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0641 P0615 P0562 P0563 P0616
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Code

P1800

OLDSMOBILE P — Powertrain

TCM Power Control Relay Circuit Open

Brand: OLDSMOBILE
Type: P — Powertrain
Views: UK: 15 EN: 31 RU: 19
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Blown fuse for TCM/relay supply
  • Faulty TCM power control relay
  • Open or corroded wiring between fuse, relay and TCM
  • Poor or disconnected relay/TCM connector pins
  • Faulty body/engine control module that drives the relay
  • Internal fault in the TCM

Symptoms

  • Transmission warning light or MIL illuminated
  • Transmission may fail to engage or operate (no shift or limp mode)
  • Loss of shift control or limited gear selection
  • Multiple transmission-related DTCs logged
  • Engine may run but transmission behaves as if unpowered

What to check

  • Read and record all stored codes and freeze frame data with a scan tool
  • Check battery voltage (should be ~12.4–13.8 V with key on and engine off)
  • Inspect related fuses and fusible links for continuity
  • Visually inspect relay, relay socket and wiring for corrosion, damage or loose terminals
  • Check for corrosion/damage at the TCM connector and ground points
  • Confirm whether the relay coil receives a control voltage when ignition is ON (backprobe safely)

Signal parameters

  • Battery/supply voltage at relay supply terminal: ~12 V (key ON or start as applicable)
  • Relay coil control voltage: 12 V (or ground depending on design) when relay is commanded ON
  • Relay coil resistance: typically low ohms (check service manual for exact), continuity present across coil when not energized
  • Voltage at TCM power feed pin: battery voltage present when relay is closed; near 0 V when open

Diagnostic algorithm

  1. Safety first: park vehicle, set parking brake, turn ignition OFF and disconnect negative battery terminal if required before disconnecting connectors
  2. Connect a scan tool, note P1800 and any related codes, clear codes and attempt to re-create with ignition ON/engine running as required
  3. Visually inspect and test the fuse(s) for the TCM/relay circuit; replace any blown fuse and retest
  4. Locate the TCM power control relay and inspect socket/terminals for corrosion or looseness; swap with identical relay to confirm function
  5. With ignition ON (engine off) backprobe relay coil terminals: verify control side is being driven (12 V or ground) when scan tool requests TCM power; if no drive, trace to the module that controls the relay
  6. Measure battery voltage at relay supply terminal and at the relay output (feed to TCM) with relay energized; if supply is present but no output when relay is energized, replace relay
  7. If relay output is present but TCM still not powered, check continuity from relay output to TCM power pin and inspect TCM connector, repair any open/corroded wiring
  8. If wiring checks OK and relay operation is correct but code persists, test/replace the module that commands the relay (refer to vehicle wiring diagram) or consider TCM internal fault and follow manufacturer procedures for TCM testing/replacement

Likely causes

  • Faulty or stuck open TCM power relay
  • Open circuit in relay supply or relay coil control wire
  • Blown related fuse or fusible link
  • Corroded/loose connector at relay or TCM harness

Fault status

⚠️ Status
Open circuit detected in TCM power control relay circuit — TCM may lose power or not initialize. Check relay, fuse, wiring and connectors for open or high-resistance conditions.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0641 P0615 P0562 P0563 P0616
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Send to email
Code

P1800

Other P — Powertrain

Transmission Clutch Interlock Safety Switch Circuit Failure

Brand: Other
Type: P — Powertrain
Views: UK: 19 EN: 38 RU: 21
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Blown fuse for TCM/relay supply
  • Faulty TCM power control relay
  • Open or corroded wiring between fuse, relay and TCM
  • Poor or disconnected relay/TCM connector pins
  • Faulty body/engine control module that drives the relay
  • Internal fault in the TCM

Symptoms

  • Transmission warning light or MIL illuminated
  • Transmission may fail to engage or operate (no shift or limp mode)
  • Loss of shift control or limited gear selection
  • Multiple transmission-related DTCs logged
  • Engine may run but transmission behaves as if unpowered

What to check

  • Read and record all stored codes and freeze frame data with a scan tool
  • Check battery voltage (should be ~12.4–13.8 V with key on and engine off)
  • Inspect related fuses and fusible links for continuity
  • Visually inspect relay, relay socket and wiring for corrosion, damage or loose terminals
  • Check for corrosion/damage at the TCM connector and ground points
  • Confirm whether the relay coil receives a control voltage when ignition is ON (backprobe safely)

Signal parameters

  • Battery/supply voltage at relay supply terminal: ~12 V (key ON or start as applicable)
  • Relay coil control voltage: 12 V (or ground depending on design) when relay is commanded ON
  • Relay coil resistance: typically low ohms (check service manual for exact), continuity present across coil when not energized
  • Voltage at TCM power feed pin: battery voltage present when relay is closed; near 0 V when open

Diagnostic algorithm

  1. Safety first: park vehicle, set parking brake, turn ignition OFF and disconnect negative battery terminal if required before disconnecting connectors
  2. Connect a scan tool, note P1800 and any related codes, clear codes and attempt to re-create with ignition ON/engine running as required
  3. Visually inspect and test the fuse(s) for the TCM/relay circuit; replace any blown fuse and retest
  4. Locate the TCM power control relay and inspect socket/terminals for corrosion or looseness; swap with identical relay to confirm function
  5. With ignition ON (engine off) backprobe relay coil terminals: verify control side is being driven (12 V or ground) when scan tool requests TCM power; if no drive, trace to the module that controls the relay
  6. Measure battery voltage at relay supply terminal and at the relay output (feed to TCM) with relay energized; if supply is present but no output when relay is energized, replace relay
  7. If relay output is present but TCM still not powered, check continuity from relay output to TCM power pin and inspect TCM connector, repair any open/corroded wiring
  8. If wiring checks OK and relay operation is correct but code persists, test/replace the module that commands the relay (refer to vehicle wiring diagram) or consider TCM internal fault and follow manufacturer procedures for TCM testing/replacement

Likely causes

  • Faulty or stuck open TCM power relay
  • Open circuit in relay supply or relay coil control wire
  • Blown related fuse or fusible link
  • Corroded/loose connector at relay or TCM harness

Fault status

⚠️ Status
Open circuit detected in TCM power control relay circuit — TCM may lose power or not initialize. Check relay, fuse, wiring and connectors for open or high-resistance conditions.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0641 P0615 P0562 P0563 P0616
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Code

P1800

SATURN P — Powertrain

TCM Power Control Relay Circuit Open

Brand: SATURN
Type: P — Powertrain
Views: UK: 14 EN: 31 RU: 19
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Blown fuse for TCM/relay supply
  • Faulty TCM power control relay
  • Open or corroded wiring between fuse, relay and TCM
  • Poor or disconnected relay/TCM connector pins
  • Faulty body/engine control module that drives the relay
  • Internal fault in the TCM

Symptoms

  • Transmission warning light or MIL illuminated
  • Transmission may fail to engage or operate (no shift or limp mode)
  • Loss of shift control or limited gear selection
  • Multiple transmission-related DTCs logged
  • Engine may run but transmission behaves as if unpowered

What to check

  • Read and record all stored codes and freeze frame data with a scan tool
  • Check battery voltage (should be ~12.4–13.8 V with key on and engine off)
  • Inspect related fuses and fusible links for continuity
  • Visually inspect relay, relay socket and wiring for corrosion, damage or loose terminals
  • Check for corrosion/damage at the TCM connector and ground points
  • Confirm whether the relay coil receives a control voltage when ignition is ON (backprobe safely)

Signal parameters

  • Battery/supply voltage at relay supply terminal: ~12 V (key ON or start as applicable)
  • Relay coil control voltage: 12 V (or ground depending on design) when relay is commanded ON
  • Relay coil resistance: typically low ohms (check service manual for exact), continuity present across coil when not energized
  • Voltage at TCM power feed pin: battery voltage present when relay is closed; near 0 V when open

Diagnostic algorithm

  1. Safety first: park vehicle, set parking brake, turn ignition OFF and disconnect negative battery terminal if required before disconnecting connectors
  2. Connect a scan tool, note P1800 and any related codes, clear codes and attempt to re-create with ignition ON/engine running as required
  3. Visually inspect and test the fuse(s) for the TCM/relay circuit; replace any blown fuse and retest
  4. Locate the TCM power control relay and inspect socket/terminals for corrosion or looseness; swap with identical relay to confirm function
  5. With ignition ON (engine off) backprobe relay coil terminals: verify control side is being driven (12 V or ground) when scan tool requests TCM power; if no drive, trace to the module that controls the relay
  6. Measure battery voltage at relay supply terminal and at the relay output (feed to TCM) with relay energized; if supply is present but no output when relay is energized, replace relay
  7. If relay output is present but TCM still not powered, check continuity from relay output to TCM power pin and inspect TCM connector, repair any open/corroded wiring
  8. If wiring checks OK and relay operation is correct but code persists, test/replace the module that commands the relay (refer to vehicle wiring diagram) or consider TCM internal fault and follow manufacturer procedures for TCM testing/replacement

Likely causes

  • Faulty or stuck open TCM power relay
  • Open circuit in relay supply or relay coil control wire
  • Blown related fuse or fusible link
  • Corroded/loose connector at relay or TCM harness

Fault status

⚠️ Status
Open circuit detected in TCM power control relay circuit — TCM may lose power or not initialize. Check relay, fuse, wiring and connectors for open or high-resistance conditions.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0641 P0615 P0562 P0563 P0616
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