P1170 Code: Meaning, Symptoms, Causes & Fix

Overview

P1170 is triggered when monitoring logic identifies an issue with ESO - Engine Shut Off Solenoid Fault affecting powertrain controls.

Symptoms

check engine light
rough operation in certain conditions
reduced performance

Common causes

Electrical fault in the affected circuit affecting eso - engine shut off solenoid fault
Control module logic or calibration issue
Connector pin damage/corrosion or harness stress near related components

How to diagnose P1170

Confirm P1170 and capture freeze-frame data with a professional scan tool.
Inspect wiring, connectors, and grounds related to eso - engine shut off solenoid fault for obvious defects.
Use freeze-frame and live data to isolate whether the issue is electrical, mechanical, or control logic.
Check for related DTCs to identify the root-cause chain before replacing parts.
After repair, clear codes and confirm readiness monitors complete without recurrence.

Severity of code P1170

Low: This code is low to moderate severity in most cases, but diagnosis is still recommended to avoid recurring warnings.

Can you drive with P1170?

The vehicle is often drivable with P1170, but plan a repair window to prevent repeat faults.

If the warning lamp is flashing or drivability/safety is affected, avoid driving and diagnose immediately.

How to fix it (step-by-step)

Repair obvious wiring/connector faults first to prevent repeat parts replacement.
Address the root fault mode (generic) in the eso - engine shut off solenoid fault circuit/system.
Apply the required relearn/adaptation procedure if specified by service information.
Road-test and verify P1170 remains cleared under the conditions that originally set the code.

Fix options

Inspect circuit and connector condition.
Test component operation and replace if faulty.
Clear DTCs and verify with live data and completed drive cycle.

Typical repair cost

$100-$450

Common mistakes when diagnosing P1170

Replacing parts without verifying voltage, ground, and signal integrity first.
Ignoring related stored/pending codes that indicate upstream faults.
Skipping post-repair verification drive cycle and readiness checks.

P1170 in common vehicles

P1170 appears across makes such as Ford, Toyota, Honda, Chevrolet. Failure patterns differ by platform: wiring routes, software calibration, and component supplier revisions can change root cause.

Frequently asked questions

What causes P1170?

P1170 is commonly set by generic faults affecting eso - engine shut off solenoid fault.

How much does it cost to fix P1170?

For P1170, repair costs are typically $100-$450 depending on exact root cause, labor rates, and part quality.

Can I clear P1170 without repair?

You can clear P1170 temporarily, but the code usually returns until the underlying fault is corrected.