Ford code P166A is an error code indicating an issue with the restraints deployment communication circuit. It sets when the Powertrain Control Module (PCM) discovers an open or short in the IES circuit. Often, this code can be caused by a variety of issues, such as an IES circuit being open, short to ground, or short to voltage. To help diagnose and resolve this issue, there are several service bulletins available for reference, including 13-6-15, 13-6-16, 13-6-3, 18B07, SSM47077, SSM47154, SSM47621, and SSM47803. In this article, we will discuss the causes and solutions for the Ford Code P166A.
Causes and Solutions for Ford Code P166A
| Cause | Solution |
|---|---|
| IES circuit open | Check circuit for open, repair or replace as needed. |
| IES circuit short to ground | Check circuit for short, repair or replace as needed. |
| IES circuit short to voltage | Check circuit for short, repair or replace as needed. |
| Faulty wiring/connectors | Inspect wiring, repair or replace as needed. |
Ford Code P166A is a warning that the Powertrain Control Module (PCM) has detected an open or short in the IES circuit. Although the cause can vary, the most common culprits are an open IES circuit, a short to ground, or a short to voltage. To help diagnose and resolve this problem, Ford has published several service bulletins, such as 13-6-15, 13-6-16, 13-6-3, 18B07, SSM47077, SSM47154, SSM47621, and SSM47803. The solutions for Ford Code P166A can include checking the circuit for an open or short, repairing or replacing the IES circuit and wiring, and inspecting the wiring for faults.
Open IES Circuit
When the IES circuit is open, a Ford Code P166A will be set. To diagnose and repair this issue, the circuit should be inspected for an open. If an open is found, it should be repaired or replaced as needed.
Short to Ground
If the IES circuit is short to ground, the Ford Code P166A will be set. To diagnose and repair this issue, the circuit should be inspected for a short. If a short is found, it should be repaired or replaced as needed.
Short to Voltage
If the IES circuit is short to voltage, the Ford Code P166A will be set. To diagnose and repair this issue, the circuit should be inspected for a short. If a short is found, it should be repaired or replaced as needed.
Faulty Wiring/Connectors
If there is a fault in the wiring or connectors, the Ford Code P166A will be set. To diagnose and repair this issue, the wiring should be inspected for faults. If a fault is found, it should be repaired or replaced as needed.
Conclusion: How to Resolve Ford Code P166A
The Ford Code P166A may be caused by a variety of issues, such as an open IES circuit, a short to ground, a short to voltage, or a faulty wiring/connectors. To help diagnose and resolve this problem, Ford has published several service bulletins, such as 13-6-15, 13-6-16, 13-6-3, 18B07, SSM47077, SSM47154, SSM47621, and SSM47803. The solutions for Ford Code P166A can include checking the circuit for an open or short, repairing or replacing the IES circuit and wiring, and inspecting the wiring for faults.
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