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Home / DTC / P0973 — Shift Solenoid A Control Circuit Low

P0973 — Shift Solenoid A Control Circuit Low

Detailed page for trouble code P0973.

34,405codes
59brands
11,914generic
22,491specific
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Code

P0973

Generic P — Powertrain

Shift Solenoid A Control Circuit Low

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

Causes

  • Short to ground in the Shift Solenoid A control wire
  • Open or high-resistance wiring/connector between TCM/PCM and solenoid
  • Corroded/loose connector or poor terminal contact
  • Faulty shift solenoid A (coil short or open)
  • Faulty TCM/PCM output driver or internal short
  • Blown fuse or poor battery supply to the transmission solenoid circuit

Symptoms

  • Check Engine / Transmission warning light illuminated
  • Transmission may default to limp mode or single-gear operation
  • Harsh, delayed, or erratic shifting
  • Inability to shift into certain gears or no upshift
  • Storage of related transmission DTCs (other shift solenoid codes)

What to check

  • Read and record freeze frame and all transmission-related codes with a capable scan tool
  • Verify battery voltage (key-on) and fuses/relays for transmission circuits
  • Inspect wiring and connectors at the transmission solenoid pack and TCM/PCM for corrosion, damage, or bent pins
  • Backprobe solenoid connector while monitoring scan tool commanded status and circuit voltage
  • Measure solenoid coil resistance with a multimeter (engine off, harness disconnected)
  • Perform wiggle test on harness while monitoring live data for intermittent changes

Signal parameters

  • Typical solenoid coil resistance (varies by vehicle): ~5–50 ohms (consult service data)
  • Expected supply voltage at solenoid connector with key ON: ~11–14 V (battery voltage)
  • Control-driver behavior: when controller grounds the circuit expect near 0 V on switched pin; when off expect near supply voltage (if PCM switches to ground) — confirm with vehicle wiring type
  • Typical solenoid current draw when energized: ~0.2–2 A (vehicle-specific)

Diagnostic algorithm

  1. Retrieve freeze frame and full code list; clear codes and attempt to reproduce.
  2. Visually inspect connectors and wiring between TCM/PCM and the transmission solenoid pack for damage, corrosion, or poor seating.
  3. Verify battery voltage and check related fuses/relays; repair any supply issues before further testing.
  4. With ignition ON (engine off), backprobe the solenoid connector and observe voltage while commanding Shift Solenoid A ON/OFF from a scan tool. Note voltages and compare to expected behavior.
  5. If commanded ON but voltage is low (near 0 V) suspect short to ground; disconnect the solenoid harness and measure resistance from the control pin to ground to locate short in harness.
  6. With harness disconnected, measure solenoid coil resistance at the solenoid terminals. Compare to OEM spec. If out of range, bench-test or replace the solenoid.
  7. Perform continuity and resistance checks between TCM/PCM pin and solenoid connector pin; repair any open/high-resistance sections.
  8. If wiring and solenoid test OK, suspect TCM/PCM output driver failure—verify with manufacturer procedures before replacing module.
  9. After repairs, clear codes and test drive to confirm the fault does not return. Ensure transmission fluid level and condition are acceptable.

Likely causes

  • Damaged insulation pinched and grounded (harness chafing)
  • Corroded transmission connector or bent pin at harness/solenoid
  • Failed solenoid coil (low internal resistance or internal short)
  • TCM/PCM output transistor failed to provide expected voltage or ground
  • Poor battery voltage or supply fuse related to transmission solenoid circuit

Fault status

⚠️ Status
P0973 - Shift Solenoid A Control Circuit Low (Low voltage detected on Shift Solenoid A circuit)
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

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Code

P0973

HUMMER P — Powertrain

PCM detects an open or short to ground in the 1-2 SS valve circuit

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

Causes

  • Short to ground in the Shift Solenoid A control wire
  • Open or high-resistance wiring/connector between TCM/PCM and solenoid
  • Corroded/loose connector or poor terminal contact
  • Faulty shift solenoid A (coil short or open)
  • Faulty TCM/PCM output driver or internal short
  • Blown fuse or poor battery supply to the transmission solenoid circuit

Symptoms

  • Check Engine / Transmission warning light illuminated
  • Transmission may default to limp mode or single-gear operation
  • Harsh, delayed, or erratic shifting
  • Inability to shift into certain gears or no upshift
  • Storage of related transmission DTCs (other shift solenoid codes)

What to check

  • Read and record freeze frame and all transmission-related codes with a capable scan tool
  • Verify battery voltage (key-on) and fuses/relays for transmission circuits
  • Inspect wiring and connectors at the transmission solenoid pack and TCM/PCM for corrosion, damage, or bent pins
  • Backprobe solenoid connector while monitoring scan tool commanded status and circuit voltage
  • Measure solenoid coil resistance with a multimeter (engine off, harness disconnected)
  • Perform wiggle test on harness while monitoring live data for intermittent changes

Signal parameters

  • Typical solenoid coil resistance (varies by vehicle): ~5–50 ohms (consult service data)
  • Expected supply voltage at solenoid connector with key ON: ~11–14 V (battery voltage)
  • Control-driver behavior: when controller grounds the circuit expect near 0 V on switched pin; when off expect near supply voltage (if PCM switches to ground) — confirm with vehicle wiring type
  • Typical solenoid current draw when energized: ~0.2–2 A (vehicle-specific)

Diagnostic algorithm

  1. Retrieve freeze frame and full code list; clear codes and attempt to reproduce.
  2. Visually inspect connectors and wiring between TCM/PCM and the transmission solenoid pack for damage, corrosion, or poor seating.
  3. Verify battery voltage and check related fuses/relays; repair any supply issues before further testing.
  4. With ignition ON (engine off), backprobe the solenoid connector and observe voltage while commanding Shift Solenoid A ON/OFF from a scan tool. Note voltages and compare to expected behavior.
  5. If commanded ON but voltage is low (near 0 V) suspect short to ground; disconnect the solenoid harness and measure resistance from the control pin to ground to locate short in harness.
  6. With harness disconnected, measure solenoid coil resistance at the solenoid terminals. Compare to OEM spec. If out of range, bench-test or replace the solenoid.
  7. Perform continuity and resistance checks between TCM/PCM pin and solenoid connector pin; repair any open/high-resistance sections.
  8. If wiring and solenoid test OK, suspect TCM/PCM output driver failure—verify with manufacturer procedures before replacing module.
  9. After repairs, clear codes and test drive to confirm the fault does not return. Ensure transmission fluid level and condition are acceptable.

Likely causes

  • Damaged insulation pinched and grounded (harness chafing)
  • Corroded transmission connector or bent pin at harness/solenoid
  • Failed solenoid coil (low internal resistance or internal short)
  • TCM/PCM output transistor failed to provide expected voltage or ground
  • Poor battery voltage or supply fuse related to transmission solenoid circuit

Fault status

⚠️ Status
P0973 - Shift Solenoid A Control Circuit Low (Low voltage detected on Shift Solenoid A circuit)
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

Similar codes

P0750 P0970 P0971 P0972 P0755
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

P0973

LAND ROVER P — Powertrain

Gear Shift Solenoid A Control - Low Circuit

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

Causes

  • Short to ground in the Shift Solenoid A control wire
  • Open or high-resistance wiring/connector between TCM/PCM and solenoid
  • Corroded/loose connector or poor terminal contact
  • Faulty shift solenoid A (coil short or open)
  • Faulty TCM/PCM output driver or internal short
  • Blown fuse or poor battery supply to the transmission solenoid circuit

Symptoms

  • Check Engine / Transmission warning light illuminated
  • Transmission may default to limp mode or single-gear operation
  • Harsh, delayed, or erratic shifting
  • Inability to shift into certain gears or no upshift
  • Storage of related transmission DTCs (other shift solenoid codes)

What to check

  • Read and record freeze frame and all transmission-related codes with a capable scan tool
  • Verify battery voltage (key-on) and fuses/relays for transmission circuits
  • Inspect wiring and connectors at the transmission solenoid pack and TCM/PCM for corrosion, damage, or bent pins
  • Backprobe solenoid connector while monitoring scan tool commanded status and circuit voltage
  • Measure solenoid coil resistance with a multimeter (engine off, harness disconnected)
  • Perform wiggle test on harness while monitoring live data for intermittent changes

Signal parameters

  • Typical solenoid coil resistance (varies by vehicle): ~5–50 ohms (consult service data)
  • Expected supply voltage at solenoid connector with key ON: ~11–14 V (battery voltage)
  • Control-driver behavior: when controller grounds the circuit expect near 0 V on switched pin; when off expect near supply voltage (if PCM switches to ground) — confirm with vehicle wiring type
  • Typical solenoid current draw when energized: ~0.2–2 A (vehicle-specific)

Diagnostic algorithm

  1. Retrieve freeze frame and full code list; clear codes and attempt to reproduce.
  2. Visually inspect connectors and wiring between TCM/PCM and the transmission solenoid pack for damage, corrosion, or poor seating.
  3. Verify battery voltage and check related fuses/relays; repair any supply issues before further testing.
  4. With ignition ON (engine off), backprobe the solenoid connector and observe voltage while commanding Shift Solenoid A ON/OFF from a scan tool. Note voltages and compare to expected behavior.
  5. If commanded ON but voltage is low (near 0 V) suspect short to ground; disconnect the solenoid harness and measure resistance from the control pin to ground to locate short in harness.
  6. With harness disconnected, measure solenoid coil resistance at the solenoid terminals. Compare to OEM spec. If out of range, bench-test or replace the solenoid.
  7. Perform continuity and resistance checks between TCM/PCM pin and solenoid connector pin; repair any open/high-resistance sections.
  8. If wiring and solenoid test OK, suspect TCM/PCM output driver failure—verify with manufacturer procedures before replacing module.
  9. After repairs, clear codes and test drive to confirm the fault does not return. Ensure transmission fluid level and condition are acceptable.

Likely causes

  • Damaged insulation pinched and grounded (harness chafing)
  • Corroded transmission connector or bent pin at harness/solenoid
  • Failed solenoid coil (low internal resistance or internal short)
  • TCM/PCM output transistor failed to provide expected voltage or ground
  • Poor battery voltage or supply fuse related to transmission solenoid circuit

Fault status

⚠️ Status
P0973 - Shift Solenoid A Control Circuit Low (Low voltage detected on Shift Solenoid A circuit)
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

Similar codes

P0750 P0970 P0971 P0972 P0755
261

Browse 261 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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+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
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