2013 Kia Soul P0335 Code and Multiple Low Voltage Faults: Real Diagnostic Process That Saved an Unnecessary Repair
Modern vehicles can throw some incredibly misleading trouble codes when battery voltage drops too low. That’s exactly what happened with this 2013 Kia Soul.
At first glance, the vehicle appeared to have a crankshaft position sensor problem. The check engine light was on, and the scan tool showed a P0335 crankshaft position sensor circuit code. On many vehicles, that immediately sends people down the path of replacing sensors, tearing into wiring harnesses, or even suspecting PCM issues.
But this case turned out to be a perfect example of why proper automotive troubleshooting matters more than throwing parts at a problem.
This is also a great lesson for anyone learning about diagnosing car problems or looking for used car inspection tips before buying a vehicle that may have hidden electrical issues.
🔧 Recommended Diagnostic Tools
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Autel MaxiSys MS906 Pro TS Scanner
This is an excellent professional-level scanner that gives you access to multiple vehicle modules, live data, and bidirectional controls. Tools like this are critical for real automotive troubleshooting because modern vehicles store faults in far more places than just the engine computer.
Power Probe 3 Circuit Tester
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Power Probe ECT3000 Short Finder
When electrical problems get serious, this tool becomes a lifesaver. It helps track down shorts and wiring faults hidden deep inside harnesses without tearing the vehicle apart unnecessarily.
Vehicle Overview
The vehicle involved was a 2013 Kia Soul that had recently spent time sitting at a paint and body shop. The owner brought it in with a check engine light illuminated and several additional warning codes stored throughout multiple modules.
At first glance, the number of faults looked concerning. However, experienced technicians know that multiple module faults often point toward one shared issue instead of several unrelated failures.
That’s where the diagnostic process becomes critical.
Vehicle Concern
The primary concern was the illuminated check engine light.
The scan revealed a P0335 code stored in the engine control module:
P0335 – Crankshaft Position Sensor “A” Circuit
In addition to that code, several other modules contained history faults related to low system voltage.
These included:
Electronic Stability Control faults
Airbag module low voltage codes
TPMS battery voltage low codes
Occupant detection system voltage faults
This combination of symptoms immediately raised suspicion toward a low voltage event rather than multiple failed components.
Initial Inspection
One of the first things to establish during diagnosing car problems is whether the issue is current or historical.
The crankshaft position sensor code was stored as a history code rather than an active fault. That distinction matters.
If a crankshaft sensor is actively failing, the vehicle will often show symptoms such as:
Extended crank time
Stalling
No-start conditions
Intermittent RPM loss
Poor drivability
In this case, none of those symptoms were currently present.
That immediately changed the direction of the automotive troubleshooting process.
Codes Retrieved
The vehicle contained the following stored faults:
P0335 – Crankshaft Position Sensor “A” Circuit
C1688 – Vehicle Safety Management signal error
B1102 – Battery voltage low
C1126 – TPMS ECU battery voltage low
B1112 – Ignition voltage low
This pattern is extremely important.
When multiple modules begin reporting voltage-related concerns at the same time, experienced technicians start thinking about system-wide electrical instability rather than isolated component failures.
Diagnostic Process
The first step was verifying battery condition.
Too many people make the mistake of replacing sensors immediately after seeing a crankshaft position sensor code. Unfortunately, that often leads to wasted money and unnecessary repairs.
The battery was tested using a proper load tester. The battery was rated at 600 cold cranking amps and tested at approximately 456 CCA. The tester still rated the battery as good.
At first glance, some might assume that means the battery could not have caused the issue. But that’s not necessarily true.
A battery can test acceptable today while still having experienced a severe discharge event days or weeks earlier.
That’s especially common on vehicles that sit for extended periods at body shops, dealerships, auctions, or storage lots.
Once battery voltage drops significantly, modern control modules can begin behaving unpredictably. Modules may lose communication, sensors may temporarily drop offline, and numerous false trouble codes can set throughout the vehicle.
This is particularly common on Hyundai and Kia platforms.
The crankshaft position sensor PID was also checked through live data. On many Kia systems, there is not always a dedicated CKP voltage PID available through aftermarket scan tools. Instead, the easiest verification is monitoring engine RPM during cranking.
If RPM is present while cranking, the crankshaft position sensor is typically producing a usable signal.
No active drivability concerns or crank signal loss symptoms were observed during testing.
Key Findings
The key clue in this case was the collection of low voltage history codes spread across multiple modules.
That pattern strongly suggested the vehicle had experienced a dead or severely discharged battery while sitting.
The P0335 crankshaft position sensor code likely set during that low voltage event when sensor signal integrity temporarily dropped below the threshold expected by the engine control module.
This is one of the most overlooked common causes of misleading trouble codes on modern vehicles.
Final Diagnosis
The vehicle most likely experienced a prior low voltage condition due to extended sitting time.
No active crankshaft position sensor failure symptoms were present during testing.
The battery tested acceptable at the time of inspection, and all faults were stored as history codes rather than current failures.
All codes were cleared, and the vehicle was returned for monitoring.
At this stage, replacing the crankshaft position sensor would have been unnecessary and premature.
Common Causes
Situations like this are extremely common in modern vehicles, especially those that sit unused for extended periods.
Some of the most common causes include:
Weak or discharged batteries
Poor battery terminal connections
Jump-start voltage spikes
Long-term storage
Low charging voltage
Corroded grounds
Intermittent voltage drops during cranking
This is why understanding symptoms and system behavior is far more important than blindly replacing parts based on trouble codes alone.
Lessons for Buyers / DIYers
This case is a perfect reminder that trouble codes do not automatically identify failed parts.
A P0335 code does not always mean the crankshaft sensor itself is defective.
For DIY mechanics and used car buyers, this is where experience and proper testing matter most. Vehicles with multiple low voltage history codes often point toward battery or charging system events rather than catastrophic electrical failures.
One of the best used car inspection tips is to scan every module in the vehicle, not just the engine computer. Hidden voltage history codes can tell you a lot about how a vehicle was treated before you bought it.
Good diagnostics is about understanding patterns—not guessing.
Don’t Get Burned on Your Next Used Car
If you’re thinking about buying a used car—or even if you already have one—this is exactly the kind of problem that can slip through the cracks and cost you big money later.
After 35+ years in the automotive field, I’ve seen firsthand how often people end up with vehicles that have hidden issues just like this.
That’s why I put together a simple Used Car Guide to help you understand what to look for and how to avoid making a costly mistake.
It’s a quick, practical guide designed to give you the right mindset and approach before you buy.
👉 https://stan.store/BobbyWhiteside
AFFILIATE DISCLAIMER
Disclaimer: Some links in this post may be affiliate links. I may earn a small commission at no extra cost to you. I only recommend tools I personally use and trust in real-world diagnostics.
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