P2774 OBD-II Trouble Code: 4WD Low Switch Circuit High

Our certified mechanics come to you · Get a fair and transparent estimate upfront

Red-stars EXCELLENT RATING ON

Cost of diagnosing the P2774 code

P2774 is a diagnostic trouble code (DTC) for "4WD Low Switch Circuit High". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford$20.00
Toyota$20.00
BMW$20.00
SCHEDULE P2774 DIAGNOSTIC Get a fair and transparent estimate upfront

P2774 code definition

Exclusive to AWD or 4WD vehicles, a P2774 code means the vehicle’s PCM has detected a problem in the low switch circuit for 4WD. A hard code has been registered and the malfunction indicator lamp (MIL) has illuminated. If you ever find a P2774 code in a 2WD vehicle, there could be a programming issue or a defective PCM.

What the P2774 code means

The P2774 code is an indicator of a problem in the actuator switch circuit for 4WD. This 4WD switch controls the actuation of the 4WD system, and changes between gear ratios in the transfer case – 2WD high, 2WD low, neutral, 4WD high and 4WD low.

What causes the P2774 code?

A P2774 code can be caused by an actuator failure or a failed 4WD switch. Other problems can include:

  • Faulty sensors
  • Faulty solenoids
  • Faulty switches
  • Defective wiring harness or connectors

What are the symptoms of the P2774 code?

Symptoms of a P2774 code can include:

  • Illuminated MIL
  • Failure to shift from 2wd to 4wd low or high, or back again
  • Engine stalls while stopped and in gear
  • Harsh shifts
  • Complete transfer case failure

How does a mechanic diagnose the P2774 code?

Many vehicles, especially older models, rely on a combination of engine vacuum and electronics to actuate shifts in the transfer case. Most newer vehicles, on the other hand, use full-electronic systems of sensors and solenoids to shift from low to high range or back again. Other systems are designed with solenoids that lock front hubs into place, with manual levers to allow shifting for the transfer case. Still others (on AWD vehicles) can automatically switch from 2WD to AWD according to road conditions.

Regardless, practically all OBD II equipped vehicles are designed with an electronic transfer case module that interacts with other control modules and enacts transfer case and front differential changes. 4WD switches may vary, but for on-demand systems, the switch is the “on/off” variety and is mounted in the interior, within reach of the driver.

  • Inspect all wiring and connectors, and repair/replace any damaged, shorted, disconnected or corroded wiring, connectors or components if found.

  • After any repairs of wiring, connectors and components (including fuses), retest the system. If everything seems to be in working order, connect a scanner or code reader to the vehicle’s diagnostic port, recording all stored codes and data.

  • Clear codes and operate the vehicle to see if codes return. If not, there may be an intermittent condition which may need to be allowed to worsen again to make an accurate diagnosis.

  • Should the code return right away, find a factory wiring schematic with connector details. Check for battery voltage on the 4WD switch’s input side, using your digital volt/ohmmeter. If no voltage can be found on the switch’s input side, disconnect any related control modules and check for continuity between the input circuit at the clutch position sensor and the system fuse.

  • Repair any open or shorted circuits.

  • If voltage is present on the 4WD switch’s input side, use the scanner to enable the 4WD system and check voltage readings on the switch’s output side.

  • If voltage is present on the input side but not the output side, with 4WD engaged, a faulty 4WD switch could be the culprit. Replace the switch if needed, and retest the system afterward. If voltage is present at the clutch position sensor’s output circuit, check for voltage at the actuator for 4WD.

  • If no voltage is present, check between the switch and PCM for resistance and circuit continuity, and compare your readings to manufacturer’s specs.

  • Repair any shorted or open circuits/connectors that are faulty, and refer to the factory wiring schematic to ensure you don’t miss any circuits. If readings all agree with factory specs, suspect the PCM itself but remember that faulty PCMs are rare.

Common mistakes when diagnosing the P2774 code

Too many times, P2774 codes have been misdiagnosed, resulting in a complete (very expensive) rebuild or replacement of the transfer case, when a proper diagnosis and replacement of a component may well have fixed the problem.

How serious is the P2774 code?

The P2774 code can result in a vehicle that’s completely disabled, stranding a driver by the side of the road.

What repairs can fix the P2774 code?

  • Replacement of the 4WD switch or activator
  • Replacement of failed sensors
  • Replacement of solenoids or switches
  • Overhaul of wiring harness and/or connectors

Additional comments for consideration regarding the P2774 code

As with any repair job, a P2774 code calls for a thorough investigation of possible causes and a factory service guide and wiring schematic as a guide. Be certain to disconnect any related control modules before testing the 4WD switch and circuits.

Need help with a P2774 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

p2774
trouble codes
Check Engine Light

No more waiting rooms! Our mechanics will come to you to diagnose and fix the P2774 code.

SCHEDULE P2774 DIAGNOSTIC
Get a $20 credit for the follow-up repair

Recent Check Engine Light is on Inspection reviews

Excellent Rating


YourMechanic Check Engine Light is on Inspection Service

Average Rating

4.8/5

Number of Reviews

5,395

Rating Summary
4,978
202
50
30
135
4,978
202
50
30
135

Anthony

6 years of experience
18 reviews
Anthony
6 years of experience
Jeep Grand Cherokee - Check Engine Light is on - Carmichael, California
Anthony was great! We are very happy that we chose to go with this company instead of the overpriced and slow service we get from the Jeep dealership. He was on time and did the job just as expected. He identified a couple of other things that need to be done before the problems get worse. We appreciate having a technician give us direct feedback regarding our vehicle, rather than a service advisor (salesperson) that we've had to deal with in the past at the dealership. We'll be booking the addtional services very soon and will definitely request Anthony again now that he is familiar with our vehicle!

Michael

37 years of experience
113 reviews
Michael
37 years of experience
Subaru Forester - Check Engine Light is on - Santa Fe Springs, California
Michael was punctual and courteous. He knows what he’s doing and I would absolutely recommend him to anyone.

Anthony

6 years of experience
18 reviews
Anthony
6 years of experience
BMW 740Li - Check Engine Light is on - Roseville, California
Very helpful in finding out the fault codes in my bmw 740 li. It was simple fix and that the two tube hose just had to be connected and my drive train malfunction went away. This saved me from having to go the an expensive dealership. Anthony has a good attitude about his work.

Breck

19 years of experience
613 reviews
Breck
19 years of experience
Ram 1500 - Check Engine Light is on - Houston, Texas
Breck did a great job working on my truck. Showed up on time, found any issues I had on my truck and explained everything to me so that I understood what was going on. Went above and beyond, definitely will book him for future appointments.


More related articles

P2702 OBD-II Problem Code: Trans Friction Element C Apply Time Range/Performance
P2702 means that a malfunction has occurred with the transmission friction element’s application due to leaks or low transmission fluid.
P0536 OBD-II Trouble Code: A/C Evaporator Temperature Sensor Circuit Range/Performance
P0536 means an issue with the A/C temperature sensor circuit, often caused by damaged electrical components, or low refrigerant levels.
P0044 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 1 Sensor 3)
P0044 P0044 code definition P0044 is a specific code that is set when high voltage is found in the heater control circuit. This code may be seen with P0042 and P0043. What the P0044 code means P0044 is set by...

Related questions

I have questions about my 2009 kia spectra's CEL and the codes I had read. Car run's good and was running good when light came on.

Given the three codes, a known issue with sensor wiring in that vehicle (to be discussed momentarily), and only 89,000 miles on the engine, I would judge the likelihood of sensor failure to be "average". That is, there are lots...

Engine won't turn on, all light on

I'm working on this

The check engine light often comes on and goes off after a well.

When the Check Engine Light comes on, that means that Trouble Codes, likely identifying the causes of the issue you are having, have been stored in your car's computer. The fastest way to resolve this is to have a Check...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1 (855) 347-2779 · hi@yourmechanic.com