AutoCodes – Generic – P1DAC

P1DAC Code - Engine Speed Undetermined

Quick Answer

This diagnostic monitors for a double failure of the Engine Speed signal received via Controller Area Network (CAN) and an electrical or rationality failure of the Input Speed Sensor. Common causes include Check for other Powertrain Control Module (PCM) codes. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P1DAC indicates Engine Speed Undetermined.
Common causes: Common causes include Check for other Powertrain Control Module (PCM) codes.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 1,706

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Apr 21, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1DAC Description

OBDII Code P1DAC - Engine Speed Undetermined - AutoCodes.com — P1DAC Code - Engine Speed Undetermined

What does this mean?

What are the Possible Causes of the DTC P1DAC?

Check for other Powertrain Control Module (PCM) codes

How to Fix the DTC P1DAC?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1DAC code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P1DAC code?

Need more information on how to fix the P1DAC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1DAC code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P1DAC Chrysler — Engine Speed Undetermined
P1DAC Dodge — Engine Speed Undetermined
P1DAC Fiat — Engine Speed Undetermined
P1DAC Jeep — Engine Speed Undetermined

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P1DAC Code

1. What are the common symptoms of OBDII code P1DAC (Engine Speed Undetermined)?

- Common symptoms include engine misfires, rough idling, reduced power, and illuminated Check Engine Light.

2. What are some possible causes of OBDII code P1DAC?

- Possible causes include faulty crankshaft or camshaft position sensors, damaged wiring harnesses, ECM issues, or engine mechanical problems.

3. How can I diagnose the OBDII code P1DAC?

- A thorough diagnosis involves using a professional OBDII scanner to retrieve the code, checking the engine speed sensor readings, inspecting related wiring, and performing a visual inspection of the engine components.

4. Can a DIYer fix OBDII code P1DAC at home?

- While some basic troubleshooting like checking for loose connections or damaged wires can be done at home, diagnosing and repairing the root cause of the code may require professional expertise and specialized tools.

5. What are the repair tips for resolving OBDII code P1DAC?

- Repair tips may include replacing faulty sensors, repairing damaged wiring, ensuring proper connections, performing an ECM reset, and conducting a thorough inspection of the engine components.

6. Is it safe to continue driving with OBDII code P1DAC triggered?

- It is not recommended to continue driving with the code triggered, as it can lead to further engine damage or performance issues. It's best to address the underlying problem promptly.

7. How much does it cost to repair OBDII code P1DAC?

- The repair cost can vary depending on the root cause of the code, the extent of damage, and the labor rates at the repair facility. Costs may include parts replacement, diagnostic fees, and labor charges.

8. Can a bad spark plug cause OBDII code P1DAC to appear?

- While a bad spark plug can contribute to engine performance issues, it is not a direct cause of OBDII code P1DAC. The code is typically related to engine speed sensor or ECM problems.

9. How long does it take to repair OBDII code P1DAC?

- The repair time can vary based on the complexity of the issue, the availability of parts, and the expertise of the technician. Simple fixes may take a few hours, while more complex repairs could require a day or more.

10. Are there any recalls related to OBDII code P1DAC?

- It's advisable to check with the vehicle manufacturer or the National Highway Traffic Safety Administration (NHTSA) for any recalls related to OBDII code P1DAC to see if the issue is covered under a recall program.