P1660 on Acura
Output Circuit Check Signal High
P1660 on Acura vehicles indicates output circuit check signal high. Au7o has documented this code across 1 Acura model — most commonly on Integra. This is a manufacturer-specific code (seen on Ford and some GM applications) indicating the computer detected an abnormally high voltage on an output circuit monitoring line, suggesting a controlled output (such as a solenoid or relay driver) is not switching as expected. It generally reflects an electrical/circuit problem between the PCM and the device it controls rather than a mechanical failure. Symptoms vary widely depending on which output is affected. Because exact behavior is manufacturer-specific, confirming the definition for the specific vehicle is recommended. Typical repair costs on Acura range from $150 to $3,500, depending on the specific model and root cause.
Common Causes of P1660
- •Wiring short to voltage in an output circuit
- •Faulty output driver or relay
- •Corroded or loose connector on the affected circuit
- •Open ground in the output circuit
- •Faulty controlled component (solenoid/relay)
- •PCM internal driver fault (less common)
P1660 on Acura by Model
Acura Integra(1 issue)
- 4-speed automatic: shift solenoid failure causes D4 light flash, missed shifts, and limp mode1994-1999
The Honda BAXA/MAXA 4-speed automatic in the Integra is notoriously sensitive to fluid condition and shift-solenoid contamination. Solenoid A/B failure causes flashing D4 light, harsh or missed 2-3/3-4 shifts, loss of power in D4/D3, and sometimes speedometer drop-out. Integra often faces delayed or missed shifts and manual downshifting difficulties in automatic transmissions. Shifting problems in the 1998 Integra's automatic transmission can stem from a clogged transmission filter or screen restricting fluid flow. This causes poor hydraulic pressure, leading to missed 4th gear shifts and failure to downshift. While driving, the D4 suddenly lost almost all power, wouldn't shift, and the speedometer stopped working. Codes returned were Automatic Transaxle FI A circuit failure and ELD error.
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What does P1660 mean on Acura?▼
P1660 stands for "Output Circuit Check Signal High." This is a manufacturer-specific code (seen on Ford and some GM applications) indicating the computer detected an abnormally high voltage on an output circuit monitoring line, suggesting a controlled output (such as a solenoid or relay driver) is not switching as expected. It generally reflects an electrical/circuit problem between the PCM and the device it controls rather than a mechanical failure. Symptoms vary widely depending on which output is affected. Because exact behavior is manufacturer-specific, confirming the definition for the specific vehicle is recommended. On Acura specifically, this code is documented across 1 model.
What causes P1660 on Acura vehicles?▼
Common causes on Acura: Wiring short to voltage in an output circuit, Faulty output driver or relay, Corroded or loose connector on the affected circuit, Open ground in the output circuit, Faulty controlled component (solenoid/relay). Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P1660 on a Acura?▼
Repair costs on Acura range from $150 to $3,500, depending on the specific model and root cause.
Which Acura models have P1660 documented?▼
Au7o has documented P1660 on 1 Acura model: Integra.