P0750
Shift Solenoid A MalfunctionP0750 is a generic OBD-II powertrain diagnostic trouble code: Shift Solenoid A Malfunction. It is logged by the engine control unit when the powertrain monitor detects that a specific fault threshold has been exceeded — typically resulting in the malfunction-indicator lamp (MIL / check-engine light) being illuminated.
What P0750 means
P0750 — Shift Solenoid A Malfunction — is stored when the TCM detects a general electrical or functional fault on Shift Solenoid A (SSA), the solenoid responsible for directing hydraulic fluid to engage a specific set of clutch packs or bands and thereby produce the correct gear ratio. 'Shift Solenoid A' is an SAE-generic designation; the actual solenoid labelled or mapped as 'A' varies by manufacturer and transmission model, though in most applications SSA is involved in first and second gear selection.
Because shift solenoids are bathed in transmission fluid, contaminated or degraded fluid is one of the most common triggers: varnish deposits seize the solenoid plunger and prevent it from stroking, while metallic debris can damage the solenoid coil. Electrically, P0750 is triggered by an open solenoid winding, a wiring harness fault between the TCM and the solenoid body, or a corroded connector.
Transmission behaviour with an SSA fault typically includes missing or slipping gears (usually 1st–2nd on most platforms), possible limp-mode activation in a single gear, and increased mechanical stress on the remaining solenoids and clutch packs.
Common causes
Most-frequently reported root causes when P0750 is logged.
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1
Open or shorted Shift Solenoid A winding — internal solenoid failure
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2
Varnish or metallic debris from degraded transmission fluid jamming the solenoid plunger
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3
Corroded, damaged, or backed-out wiring connector at the solenoid or TCM harness
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4
Broken or chafed wire in the SSA control circuit between TCM and transmission body
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5
Low transmission fluid level or pressure preventing solenoid actuation
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6
Faulty valve body — scored bores or stuck check balls defeating hydraulic control even when the solenoid operates correctly
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7
TCM internal driver fault (rule out all external causes first)
Symptoms drivers notice
How to diagnose P0750
A typical diagnostic flow when this code is present.
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1
Pull and record all DTCs from the TCM — companion solenoid codes, speed-sensor faults, or valve-body codes narrow the diagnostic to electrical vs. hydraulic vs. mechanical cause
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2
Check transmission fluid level and condition; drain and inspect the pan for varnish deposits or metallic debris before any electrical testing
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3
Disconnect the SSA connector and measure solenoid resistance with a DVOM against OEM specification (commonly 11–26 Ω depending on platform); an open (OL) or out-of-range value confirms solenoid failure
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4
Inspect the SSA wiring harness from the connector back to the TCM for chafing, corrosion, or heat damage; perform a wiggle test while monitoring resistance to catch intermittent faults
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5
With a scan tool capable of bidirectional control, command SSA on and off; confirm the TCM registers the correct current draw — no draw with a good solenoid points to a TCM driver fault
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6
Replace the faulty solenoid (individual unit or solenoid pack per OEM service guidance) and perform a fluid and filter service concurrently
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7
After repair, perform an OEM adaptive-reset / solenoid-learn procedure, road-test through all gear transitions, and confirm no recurrence of P0750 in live data
Related powertrain codes
- P0700 — Transmission Control System Malfunction
- P0701 — Transmission Control System Range/Performance
- P0702 — Transmission Control System Electrical
- P0703 — Torque Converter/Brake Switch B Circuit Malfunction
- P0704 — Clutch Switch Input Circuit Malfunction
- P0705 — Transmission Range Sensor A Circuit malfunction (PRNDL Input)
Frequently asked questions
Which gear does Shift Solenoid A control?
The SAE J2012 standard does not assign SSA to a specific gear — the actual gear mapping depends on the manufacturer and transmission model. On most common rear-wheel-drive and front-wheel-drive automatics, SSA is involved in 1st and 2nd gear selection, but always consult the OEM wiring diagram for the specific vehicle being diagnosed.
Is P0750 always a solenoid hardware failure?
No. The code can also be caused by a wiring fault between the TCM and the solenoid, a corroded connector, or degraded fluid that has seized the solenoid plunger. A resistance test and harness inspection should be performed before condemning the solenoid itself.
Can a transmission fluid service clear P0750?
Sometimes, if the solenoid plunger was temporarily seized by varnish rather than permanently damaged. A fresh fluid and filter service may free the plunger. However, if the solenoid coil has failed electrically or the wiring is damaged, a fluid service alone will not resolve the fault.
What happens if P0750 is left unrepaired?
With SSA inoperative, the transmission cannot reliably engage the gears it controls. This causes clutch-pack slip and heat build-up that accelerates wear on the friction material and the fluid. Over time, what began as a solenoid fault can progress to clutch-pack failure and a significantly more expensive repair.
Disabling P0750 in software
RaceTune can permanently disable P0750 — and any other OBD-II diagnostic trouble code — on every ECU family we support. The monitor is disabled inside the ECU itself, so the fault stops being logged: the warning light stays off and the engine never enters limp mode for this code. The change is tied to your exact software version.
Software modifications affect emissions compliance and are not road-legal in many jurisdictions. RaceTune service files are intended for motorsport, off-road, and export use.
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