Battery Voltage Too Low To Start
The SULLAIR-E010 (Sullair WS Controller) diesel fault code means: Battery Voltage Too Low To Start. This is a moderate severity code.
- Keep driving?
- No -- stop driving
- DIY difficulty
- easy
- Estimated cost
- $20-$200 DIY (battery terminal cleaning and a new group 31 battery if needed). Pro diagnosis and battery replacement with alternator check typically $150-$400 depending on labor rate and whether the alternator also needs service.
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Common Symptoms
- Sullair WS Controller LCD displays E010 when you press START
- Compressor cranks slowly or does not crank at all
- Panel powers up but engine will not fire
- RUN indicator never illuminates after initiating start sequence
- Battery charge indicator light on the panel is amber or red
- Unit worked fine last shift but sat overnight or over a weekend and now will not start
- Alternator charge light stays on during normal operation before a failed start
Probable Causes (Ranked by Likelihood)
- Discharged or sulfated battery due to extended storage or lack of use between rentals Very Likely
- Battery has reached end of service life and can no longer hold a charge above the WS Controller start threshold (typically 10.5V DC under load) Very Likely
- Loose, corroded, or high-resistance battery cable connections at the terminals or chassis ground strap Likely
- Engine alternator not recharging the battery during operation, so each start drains it further Likely
- Parasitic draw from a stuck relay, faulty controller module, or wiring short keeping the battery partially discharged Possible
- Battery disconnect switch left in the OFF position or internal switch contacts corroded, causing false low-voltage reading Possible
- Faulty battery voltage sense wire to the WS Controller giving an incorrect low reading on a good battery Less Likely
Step-by-Step Diagnostic Procedure
Check the Sullair WS Controller LCD first. If E010 is displayed, note whether it appears immediately on power-up or only after a crank attempt. Immediate display on power-up usually means the battery is deeply discharged.
Measure battery open-circuit voltage with a multimeter across the terminals before any start attempt. A healthy 12V DC battery should read 12.6V or higher. Anything below 12.0V indicates a weak or discharged battery. Below 11.5V and the WS Controller will block the start.
Inspect both battery terminals and the chassis ground strap for green or white corrosion, loose clamps, or cracked cable insulation. Clean terminals with a wire brush if corroded. Tighten clamps to remove any movement. A corroded connection can cause a 1V to 2V voltage drop that fools the controller.
If voltage is low, connect a known-good 12V DC battery charger at 10A to 15A and charge for a minimum of 2 hours. Then recheck voltage. If it climbs above 12.6V and holds, attempt a start. If the battery will not hold charge above 12.0V after charging, the battery needs replacement.
After a successful start, measure voltage across the battery terminals again with the engine running at RUN speed. You should see 13.8V DC to 14.4V DC, which confirms the engine alternator is charging. A reading at or below 12.6V while running means the alternator or charge circuit is not working and the battery will drain on the next use.
If the battery tests good and the alternator output is normal, inspect the battery sense wire that runs from the battery positive terminal to the WS Controller harness connector. Look for a loose pin, chafed insulation, or a corroded connector. A bad sense wire will cause E010 even with a fully charged battery. This step requires a wiring diagram and a multimeter set to DC volts. Call a Sullair service tech if you are not comfortable probing the controller harness.
Check for parasitic draw if the unit has been sitting for less than 48 hours and the battery is already discharged. With the panel in OFF and all accessories disconnected, connect a multimeter set to DC amps in series with the negative battery cable. A draw above 50 milliamps points to a stuck relay or a wiring fault that needs further troubleshooting with a Sullair wiring diagram.
If the battery is replaced and E010 returns within a few days of normal operation, pull engine fault codes from the engine ECM using JD Service Advisor, CAT ET, or Cummins INSITE as appropriate for your unit. A charging system fault logged in the engine ECM is the next place to look.
Frequently Asked Questions
What does Sullair code E010 mean?
E010 means the WS Controller measured the battery voltage below the minimum threshold needed to crank the diesel engine. The controller blocks the start to protect the engine from a weak cranking attempt that could damage the starter motor or fail to fire the engine.
Can the compressor still run with E010 active?
No. E010 is a hard fault that prevents the start sequence from completing. The unit will not reach RUN status until the battery voltage is restored above the controller threshold, typically around 11.5V DC at rest.
How much does it cost to fix E010?
If it is just a dead battery, a group 31 replacement battery runs $120 to $180 at a parts store and is an easy swap. If the alternator is also bad, add $100 to $200 for the alternator plus a shop labor rate of $80 to $130 per hour, putting a full repair in the $300 to $500 range.
Will the compressor start if I jump it from another vehicle?
Often yes, a jump start will clear E010 long enough to fire the engine, and then the alternator should take over charging. But if the battery is bad or the alternator is not charging, E010 will return the next time you shut down. Treat a jump start as a diagnostic step, not a fix.