AutoCodes – Toyota – P1200 Toyota

P1200 Toyota Code - Fuel Pump Relay/ECU Circuit Malfunction

Quick Answer

What it means: P1200 Toyota indicates Fuel Pump Relay/ECU Circuit Malfunction.
Common causes: Common causes include Faulty Fuel Pump ECU, Fuel Pump ECU harness is open or shorted, Fuel Pump ECU circuit poor electrical connection.
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 27,846

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 Aug 12, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1200 Toyota Description

The fuel pump speed is controlled at 3 steps (high speed, medium speed, low speed) by the condition of the engine (starting, idling, light load, heavy load), when the engine starts (STA ON) or heavy loads with engine high speed, the ECM sends a Hi signal (about 3.8 V) to the fuel pump ECU (FPC terminal). The fuel pump ECU then outputs Hi voltage (battery positive voltage) to the fuel pump so that the fuel pump operates at high speed. When the heavy loads with engine low speed, the ECM sends a Mid signal (about 2.5 V) to the fuel pump ECU (FPC terminal). The fuel pump ECU then outputs Mid voltage (about 10 V) to the fuel pump so that the fuel pump operates at medium speed.
When the idling or light loads, the ECM sends a Low signal (about 1.3 V) to the fuel pump ECU (FPC terminal). The fuel pump ECU then outputs Low voltage (about 8.5 V) to the fuel pump so that the fuel pump operates at low speed.

OBDII Code P1200 Toyota - Fuel Pump Relay/ECU Circuit Malfunction - AutoCodes.com — P1200 Toyota Code - Fuel Pump Relay/ECU Circuit Malfunction

What does this mean?

What are the Possible Causes of the DTC P1200 Toyota?

Faulty Fuel Pump ECU
Fuel Pump ECU harness is open or shorted
Fuel Pump ECU circuit poor electrical connection
Faulty Fuel Pump
Faulty Engine Control Module (ECM)

How to Fix the DTC P1200 Toyota?

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 P1200 Toyota 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 P1200 Toyota code?

Need more information on how to fix the P1200 Toyota code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1200 Toyota code diagnosed by a professional: Find a repair shop in your area

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 P1200 Toyota Code

1. What are common symptoms of OBDII code P1200 Toyota (Fuel Pump Relay/ECU Circuit Malfunction)?

Common symptoms include difficulty starting the vehicle, engine stalling, poor engine performance, and the fuel pump not priming.

2. What are the possible causes of OBDII code P1200 Toyota?

Potential causes include a faulty fuel pump relay, issues with the fuel pump circuit, a defective ECU, wiring problems, or a malfunctioning fuel pump.

3. How can I diagnose OBDII code P1200 Toyota?

Diagnosis involves checking the fuel pump relay, inspecting the fuel pump circuit for any damage, testing the ECU, and verifying the wiring connections for any faults.

4. Can a DIYer repair OBDII code P1200 Toyota?

Repairing this code may require intermediate automotive knowledge and tools. It's recommended to consult a professional mechanic for accurate diagnosis and proper repair.

5. Is it safe to continue driving with OBDII code P1200 Toyota?

It's not advisable to drive the vehicle with this code as it can lead to engine stalling or other potentially dangerous situations. Immediate attention is recommended.

6. How much does it typically cost to repair OBDII code P1200 Toyota?

The cost of repairing this code can vary depending on the specific issue causing it. It's best to obtain a diagnosis from a mechanic to get an accurate estimate.

7. Can a faulty fuel pump cause OBDII code P1200 Toyota?

Yes, a malfunctioning fuel pump can trigger this code as it may affect the fuel pump relay or the ECU circuit, leading to a malfunction.

8. Are there any preventive measures to avoid OBDII code P1200 Toyota?

Regular maintenance checks, such as inspecting the fuel system components and addressing any issues promptly, can help prevent this code from occurring.

9. How long does it take to repair OBDII code P1200 Toyota?

The repair time can vary depending on the cause of the code and the extent of the repairs needed. It's best to consult with a mechanic for a more accurate timeline.

10. Can resetting the ECU clear OBDII code P1200 Toyota?

Resetting the ECU may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to reappear. It's essential to diagnose and repair the root cause.